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Terms in this set (20)
What percent of the earth is ocean and land?
Ocean is 71%
Land is 29%
What percent of the earth's water is found in the ocean?
The average ocean temperature in ºC and ºF and how its temperature compares to the freezing point of water
average ocean temp. is 3.9C and 39F. The freezing point is 32F and 0C
The average depth of the ocean in meters and kilometers
3682 m (commonly rounded to 4,000) or 4 km.
(it's 12,081 in ft just in case she asks)
The four different subfields of oceanography and what each subfield focuses on
Physical - study waves, currents, and acoustics.
Biological - study the nature and distribution of marine organisms. Geological - study Earth's crust and composition
Chemical - study the ocean's dissolved gases and solids
The steps of the scientific method and the difference between a hypothesis and theory
revise, discard or accept hypotheses based on experiment resutls
retest hypothesis and theory
Hypothesis is a suggested explanation or an educated guess, while a theory is a tested and well verified explanation.
The definition of density and its formula
Density is defined as the mass per unit volume: density = mass/volume
How increases or decreases in mass or volume affect density
If you increase the mass of a substance, but don't change the volume, the density will increase
If you increase the volume of a substance, but don't change the mass, the density will decrease
How Earth is thought to have formed during the formation of our solar system
Earth formed from the clumping together of material (a process called accretion) orbiting our young sun
What is the age of the earth? (according to idiots who don't have proof)
4.6 billion years ago
The kind of material that Earth is thought to have formed from
iron and nickel (at the core of the earth) and silica and oxygen (at the crust)
What density stratification is and its role in the formation of Earth's layers
The minerals that made up the semisolid mass arranged themselves vertically in the Earth by density through process of density stratification
so heaviest materials formed the core and the lighter ones formed the crust.
What is outgassing?
Gas (volatiles) were released at the surface from magma as Earth was forming and becoming density stratified
How did Earth's first atmosphere form and what gases was it made up of?
Outgassing created our primitive atmosphere which had:
High in water vapor, carbon dioxide, and nitrogen
Had traces of ammonia and methane
What are the most common gases of the current atmosphere?
High in nitrogen and oxygen Nitrogen - 78.1%
Oxygen - 20.9%
Low in carbon dioxide and water vapor (and other gases) - ~1%
Which common gas of our current atmosphere was not present in our primitive atmosphere?
What was the oxygen revolution and what caused it?
Primitive plants (probably cyanobacteria) started producing oxygen through photosynthesis Oxygen started accumulating in the atmosphere
The primary process that formed our early ocean
Over time, the atmosphere cooled enough for the water vapor to condense and precipitation to fall. Water started accumulating on Earth's surface forming our first oceans.
When our first ocean formed in relation to when our first atmosphere and our Earth formed
First ocean formed 4 billion years ago and our first atmosphere and earth started to form 3.5 billion years ago (I think this is right but I'm not sure)
The role of comets or asteroids in adding to our early ocean's volume
Water within asteroids and comets hitting Earth also contributed to water accumulation
Sets found in the same folder
Oceanography: 1.1a (intro)
Oceanography Test 2 Part 1
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Ocean systems Chapter 1
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