Oceanography Exam 1

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71%

Approximately what percentage of the surface of the Earth is covered by oceans?

Pacific Ocean

Which ocean is the deepest on Earth?

True

T/F; the deepest spot in the ocean is deeper than Mt. Everest is high.

True

T/F; All the continents could fit into the space occupied by the Pacific Ocean.

best explains all available observations

Based on the scientific method, science supports the explanation of the natural world that....

the Western European world realized the vastness of Earth's water-covered surface

The Age of Discovery was the time period in ocean exploration history when...

Ferdinand Magellan

Who began the voyage of the Victoria, the first vessel known to circumnavigate the Earth

location

The GPS system is a tool used for determining surface

radiometric methods of determining the age of rocks

The most accurate scientific estimation of Earth's age is based on

nebular hypothesis

The cosmological model for the formation of the Sun and the rest of our solar system is called the

4 billion years ago

The oceans are believed to have formed about

True

T/F; The early oceans and atmospheres are thought to have come from inside Earth and were formed by a process called 'outgassing'

Density stratification has caused our Earth to be homogenous througout

What is a false statement concerning density stratification?

Plastic

Which best describes the physical property of the asthenosphere?

density

What physical property determines the order of Earth's layers?

isostatic adjustment

The vertical movement of crust to accommodate additional weight or removal of weight is called

oxygen

What gas was not abundant from Earth's early atmosphere

adaptations to different environmental conditions

The naturalist, Charles Darwin, who is credited with developing the theory of evolution by natural selection, suggested that the changes organisms display through time were the result of

Organic molecules could be created from the materials contained in Earth's early ocean and atmosphere

What did Stanley Miller's 1952 experiment demonstrate?

fossil evidence, extinctions, and boundaries of sedimentary rock units

The subdivisions of the geologic time scale were based on

Wegener's proposed mechanism for movement was thought to violate the law of physics

What was the main reason scientists objected to Alfred Wegener's idea of continental drift?

magnetic sea floor 'stripes' are symmetric with respect to the mid-ocean ridge

As a tool, paleomagnetism is a piece of modern evidence that has helped support plate tectonics by showing that

divergent

The East Pacific Rise is associated with which type of plate boundary

The ocean floor keeps regenerating itself

How is it that the ocean floor is so much younger than the ocean itself?

divergent boundaries

Plate boundaries where new oceanic crust is being added are called

broader (wider)

The faster the rate of spreading at the mid-ocean ridge or rise, the _____ the underwater volcanic mountain range

True

T/F; most lithospheric plates contain both oceanic and continental crust

none

The Hawaiian Islands are associated with which type of plate boundary

at the mid-ocean ridge

In general, where would the youngest ocean floor be found?

The oceanic plate will be subducted

What happens when an oceanic and continental plate converge?

Neither subducts, instead; a mountain range forms

What happens when two continental plates converge?

earthquakes

The best map to use to locate the world's plate boundaries is a map that shows the worldwide location of

a volcanic arc

Which of the following is associated with a subduction zone?

15 meters

How much wider is the Atlantic Ocean today than when Christopher Columbus sailed?

convergent

An ocean trench is associated with which type of plate boundary?

transform

The San Andreas Fault is associated with which type of plate boundary?

continental collision zone

Along which of the following would you NOT expect to find active volcanic activity

tropical island without a fringing reef

Which kind of tropical island would likely be the youngest?

subduction zone

What best describes the tectonic setting of the Cascade Mountains of the Pacific Northwest?

growing, shrinking

Overall, the Atlantic ocean basin is ______, and the Pacific ocean basin is ______.

depth of the ocean floor below sea level

Bathymetry involves the measurement of

sending sound through the water and determining the time required for it to return to the ship

Ocean depths are routinely determined by

The ocean water rises up to form a mound based on the mass of the seamount

What happens to the ocean water over a seamount on the ocean floor when measured from a satellite

continental shelf, slope, and then rise

If you could walk out away from the shore across the sea floor on a passive continental margin, what is the order of provinces you would cross?

abyssal hill

A small, rounded, submerged volcanic hill that rises less than 1 kilometer (0.6 mile) above the sea floor is called ________________

trenches

What feature is NOT associated with the crest of the mid-ocean ridge

along passive continental margins

Where would you expect to find well developed continental shelves

a passive; a convergent-active

The continental margin of the U.S. Atlantic coast is ____________ continental margin, and the continental margin off the west coast of South America is _____________ continental margin.

deposition of sediment by turbidity currents as deep-sea fans

What process is primarily responsible for the formation of the continental rise along the East Coast of the United States?

a series of islands, shallow banks, and deep basins

Which of the following best describes a continental borderland?

continental slope

The steep transition zone between the outer edge of the continental shelf and the deep-ocean basin is called the _______________

True

T/F; Pillow lavas (pillow basalts) indicate that molten lava came in contact with water and cooled very quickly.

True

T/F; The Andes Mountains, which are a tall mountain range along the west coast of South America, are associated with an active continental margin.

False

T/F; Turbidity currents are highly erosive and are thought to be responsible for the creation of deep-sea trenches

around the margins of the Pacific Ocean

Where is the Ring of Fire located?

They result from successive lava flows

Which of the following statements concerning graded bedding deposits is FALSE?

They are found only off of mountainous coasts

Which of the following statements about submarine canyons is FALSE?

a chimney that emits a column of hot, cloudy water formed from the precipitation of metal-rich minerals

Of the following, which is the best description of a sea floor hydrothermal vent?

It accommodates spreading of a linear ridge system on a spherical Earth

Why does the mid-ocean ridge have a zigzag appearance?

They are transform plate boundaries

Which of the following statements about fracture zones is FALSE?

made up of material derived from pre-existing rock material

Lithogenous sediments are

abyssal clay

Which of the following is the most fine-grained sediment

levitation

What is NOT an example of sediment-transporting media

grain size

In sediments, what does the Wentworth scale describe?

by turbidity currents

How is most sediment transported from the continental shelf out to the continental rise

Tests

Microscopic shells that create biogenous sediment on the sea floor are called

calcium carbonate dissolves in seawater

Beneath the calcite compensation depth (CCD), what happens

warm; cool

Calcareous ooze is associated with ________ surface water conditions, and siliceous ooze is associated with ________ surface water conditions.

Biogenous oozes are created by underwater eruptions, which cover the sea floor with fine ash particles.

What statement about biogenous oozes is FALSE

coccoliths

most chalk is made from

to have it accumulate faster than it dissolves

The only way for siliceous ooze to be preserved in the ocean is

False

T/F; Because they tend to move downslope, most lithogenous sediments are deposited in abyssal plains.

False

T/F; The calcite compensation depth (CCD) represents the depth where wave action ceases to form calcareous oolites.

False

T/F; Black volcanic beach sand is a type of hydrogenous sediment.

concentration of the particles in fecal pellets

Populations of microscopic marine organisms in ocean surface waters closely match their abundance in sediments on the ocean floor, even though it takes 10 to 50 years for an individual particle to sink to deep-ocean depths. What accounts for this pattern?

along the mid-ocean ridge beneath warm surface waters

Where are most modern-day calcareous oozes found in the ocean?

Manganese nodules are a type of foraminifer.

What statement about manganese nodules is FALSE

Clay

Which of the following is the most abundant component by weight for deep-ocean sediments?

The DSDP drilled to the center of Earth and confirmed that the outer core is composed of liquid iron-nickel material.

Which of the following statements about the Deep Sea Drilling Project (DSDP) is FALSE?

Christopher Columbus made several trips across the Atlantic and discovered the 'new world'.
Ferdinand Magellan's crew completed the first circumnavigation of the globe.

What happened during the Age of Discovery in Europe?

Waves are seen to approach the beach at an angle.

What would be considered a scientific observation?

to explain the causes and effects of observable natural phenomena

What best describes the principle goals of science

Molten material will rise if it is less dense than the surrounding material.
Molten material will sink if it is more dense than the surrounding material.
Earth is layered based on density, with the highest density material located at the deepest depths beneath Earth's surfaces.

What is true in regards to the formation of a density-stratified Earth

The lithosphere of Earth is made up of both mantle and crust.
Earth's internal layers can be described by their composition or by their physical appearance.

What is true in regards to the internal structure of the Earth

The asthenosphere is a plastic layer that extends from the base of the lithosphere to a depth of about 700 kilometers.
The asthenosphere is very hot and contains areas of partially molten rock

What is true in regards to the asthenosphere

Continental crust is less dense than oceanic crust
Continental crust is made of rock that is relatively light in color

What is true in regards to the Earth's crust

Outgassing is a direct result of density stratification
Density stratification has caused Earth's internal structure to be layered
Density stratification has caused the highest density material to be found at Earth's core
The origin of Earth's oceans and atmospheres are a result of density stratification

What is true in regards to density stratification

lithosphere that was thickened by mountain building
lithosphere that was heated by hot asthenosphere
lithosphere that was less dense

Based on the concept of isostatic adjustment, which of the following would result in the uplift of Earth''s surface?

The 'prebiotic soup' of the primitive oceans provided a likely environment for live to develop.
Early organisms likely evolved into more complex organisms.
Primitive life likely existed without the need for oxygen.
As life developed on Earth, it began to significantly change Earth's environment.

Which of the following ideas about the development of life on Earth make scientific sense?

The way the shapes of the continents fit together like pieces of a jigsaw puzzle.
The distribution of fossil pieces.
The pattern of similar mountain belts on different continents.
Evidence of glaciers in areas that are now tropical.

What lines of evidence did Alfred Wegener use to support the concept of continental drifting?

Convection in the liquid iron-nickel outer core generates a magnetic field

What is the main reason that Earth has a magnetic field?

The ocean floor is spreading apart, and new seafloor is forming.
The igneous rock of the ocean floor preserves Earth's existing magnetic field as the rock cools.
The polarity of Earth's magnetic field experiences reversals.

Why does the sea floor have a striped pattern of magnetic anomalies that is symmetric with respect to the mid-ocean ridge?

The magnetic field is oriented vertical relative to Earth's surface at the south magnetic pole.
The magnetic field is oriented horizontal (parallel) relative to Earth's surface at the magnetic equator.
Earth's magnetic field has varying dips around the world that range from vertical to horizontal, depending on latitude.
The locations of Earth's magnetic poles have moved through time and have even reversed in polarity.
The magnetic field is oriented vertical relative to Earth's surface at the north magnetic pole.

What is true in regards to Earth's magnetic field

They are oriented parallel to the mid ocean ridges

What is true in regards to sea floor magnetic anomalies

Ocean crust is destroyed at deep sea trenches
Ocean crust is created at mid-ocean ridges

What is true in regards to ocean crust?

They are all associated with zones of earthquakes.

What do all plate boundaries have in common?

The oldest ocean crust is about 200 million years old and is located near an ocean trench.

What is true in regards to the age of the ocean crust?

direct visitation of the sea floor
using satellite to measure the sea surface
sending sound through water (sonar)
recording many depths using a long cable

What techniques can be used to map the sea floor?

sea surface elevation, which varies depending on the shape of the underlying sea floor.

Measurement of ocean floor bathymetry from satellite relies on what?

turbidity currents, which are initiated here and flow down submarine canyons
a wide continental shelf

What is associated with a passive continental margin?

deposition by waves
major climate changes, such as ice ages
erosion by waves
large fluctuations in sea level

What processes are involved in the formation of continental shelves?

Turbidity currents are highly erosive and carve submarine canyons
The material carried by turbidity currents is what builds deep-sea fans
Turbidity currents move sediments down the continental shelf and the continental slope to be deposited on the continental rise
Turbidity currents are episodic events (the only occur every so often, like a flash flood)

What is true in regards to turbidity currents?

abyssal plains

Sediments deposited by the process of suspension settling produce the main sediment found on _______

hydrothermal vent
a central rift valley
basalt volcanism and pillow lavas
volcanoes

Which features are associated with the mid-ocean ridge?

the Pacific Ring of Fire
subduction zones and associated faults
very deep ocean water depths
volcanic arcs and active continental margins
narrow or no continental shelves

The majority of ocean trenches are associated with

A muddy lagoon
A sandy beach
At the base of the continental slope

In which environments would you find lithogenous sediment

In deep sea trenches not far offshore
on the continental shelf

Where would you expect to find LARGE amounts of lithogenous sediments

abyssal plains
continental shelves, rises, slopes
deep ocean trenches

Where would lithogenous sediments of any size be found

The ooze accumulates above the CCD and then is covered before being transported to deeper depths by sea floor spreading.

Which conditions allow for calcareous ooze to be found beneath the CCD?

Coccolithophores
Diatoms

Which of the following are microscopic, single-celled floating algae that accumulate to form biogenous sediment?

Radiolarians
Diatoms

Which of the following organisms are responsible for the creation of siliceous ooze?

tests of foraminifers
radiolarian ooze

What sediments are considered biogenous

coatings of metal sulfides near black smokers
manganese nodules

What sediments are considered hydrogenous

Siliceous ooze on the sea floor indicates cool surface water above
Calcareous ooze on the sea floor indicates warm surface water above

Of the following statements about surface water temperature above biogenous sea floor deposits, which is/are true?

the ancient geographical locations of ocean basins
previous ocean circulation patterns
the climate on Earth millions of years ago
past catastrophes, such as major extinction events
movement of the ocean floor

Marine sediments provide valuable clues about which of the following Earth history events?

Newfoundland

Leif Eriksson was the first to land here

Iceland

This was the first new land conquered by the vikings

Baffin Island

It is believed that Eric the Red may have discovered this area

Greenland

Eric the Red discovered this land and later started the colony

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