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26 Cards in this Set

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How do we measure depth of the seafloor?
Depth sounding- inaccurate

echo sounding- inaccurte because of changes in water = changes in speed

Satelite altemetry photos.
whats the problem with satelite altimetry?
it cannot see through the water.
what is seismic profiling?
Using an explosion and then waves are collected on different levels of the sea for evaluation (helpful in looking for oil).
about what percent of earth is above sea level?
30%
about what percent of earth is above sea level?
30%
about what percent of earth is above sea level?
30%
about what percent of earth is above sea level?
30%
about what percent of earth is above sea level?
30%
what percent of the earth is actually above sea level
30
the continental margin consists of 4 segments. what are they?
From shallow to deep.

Continental shelf
Continental slope
Continental rise
Deep sea basin
What is important about the continental shelf?
-Fisheries
-transportation
-leisure
-drilling and mining
What is important about the continental shelf?
-Fisheries
-transportation
-leisure
-drilling and mining
What is important about the continental shelf?
-fisheries
-mining and drilling
-leisure
-transportation
During the last ice age, what happened to the continental shelves?
Water taht would cover the shelves was ice in glaciers and the sheld was not covered by water.
There are two categories of continental margins. What are they and give an example of each.
Active- seismically active as the pacific coast.

passive-seismically inactive as the atlantic coast.
How do we measure the continental slope?
Rise / Run
What are submarine canyons?
Canyons found on the continental margins that form because of strong currents. They were drowned after the melting of the glaciers after the last ice age.
How are the avelanches of water and sediment that cut the canyons formed?
Underwater earthquakes.
The same currents that cut the canyons displace the sediment that creates the continental rise. What are these currents called?
turbidity currents
what do we find in the deep sea?
-Abyssal plains
-Abyssal hills
-Seamounts
-Guyots
-trenches
The abyssal plains are considered
the flattest structure in the world (no inclination/declination)
what are seamounts
Steep sided underwater volcanoes (built at hot spots or ridges)
What are guyouts?
flattened seamounts taht made it out of the ocean.
What is the shape of a trench usually?
Arc shaped
Trenches are found where?
at the base of an active margin
What is the difference between an oceanic ridge and rise?
Rise is fast spreading- flatter (Pacific)

Ridge is slowly spreading- taller (Atlantic)