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Chapter 2 The Sea Floor
Terms in this set (26)
Innermost layer; Solid inner core & liquid outer core, iron rich
Middle layer; Semi-plastic
Outermost layer; Thinnest
Continental Drift. What evidence
is there that it is occurring?
Was proposed in 1912 by Alfred Wegner. Theory that the continents once formed a super continent.
Evidence is mid-ocean ridges , geometric anomalies, and Island Arcs
Explains how continental drift is possible. Convection currents beneath the plates help heat from mantle drives the currents.
Lithospheric plates are another name for tectonic plates, which are part of the Earth's uppermost layer, the crust. The term refers to the portions into which the crust is broken.
Convection currents are movements caused by temperature changes in liquid or gas
Chain on submarine volcanic mountains that rise from the ocean floor.
A type of fault in which two tectonic plates slide past one another.
Chain of island western Pacific mostly which are usually along the continental side of deep trenches.
First single continent.
The one ocean that surrounded Pangea.
Derived from the break down of rocks (weathering)
Derived from the skeletons and shells of marine organisms.
Consists of the continental; shelf, slope, rise and Abysall Plains
Most landward; 8% of the ocean's surface area; richest area of the ocean (most animals live here)
Where the continental shelf ends and the continental slope begins
The slope between the outer edge of the continental shelf and the deep ocean floor; Steep
Formed by sediments that were pushed down
Active margins are the main sites where tectonic activity takes place (like earthquakes). This is because the continental shelf of active continental margins collide with an oceanic plate, creating subduction.
Most of the ocean floor is here; Has hills, mountains, guyots; Surprising amount of biodiversity especially around seamounts.
Fish surround them because they are warm.
Oceanic vs Continental crust - what are the major differences?
Oceanic Crust is younger (200 million years old), denser, dark colored
Continental Crust is older (3.8 billion years old), light colored, granite, and less dense
Lithogenous vs. biogenous sediments
Lithogenous sediments is from the weathering of rocks breaking down while biogenous is from the break down of sea animals.
How old is the earth? How does density play
a role in the formation of the earth's layers?
4.5 Billion years old. The heavier materials settled deep in Earth while the lighter components formed the crust.
Starting with Pangaea, how has the geologic history of the Earth changed over time?
Pangea split into the two continents Laurasia and Gondwana. From there, those continents split into the 7 continents that we know today. This also caused the Panthalassa ocean to split into four.
THIS SET IS OFTEN IN FOLDERS WITH...
Chapter 1 Science of Marine Biology
Chapter 3 Seawater and the World Ocean
Chapter 4 Fundamentals of Biology
Chapter 5 The Microbial World
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