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Stacey_Guide_9 - (9)Study Guide-Ch 4-Sea Floor Sediments...

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(9)Study Guide- Ch. 4 -Sea Floor/ Sediments (1-11-08) Sections 4.2, 4.3*, 4.4^ * up to and including the sub-section “Source and Chemistry” ^ only the sub-sections “Oil and Gas” and “Gas Hydrates” 1) Know the features of ridges/rises and trenches, and “Earth’s Structure Summary.” -ridges/rises -continuous mid-ocean ridge/rise system that stretches for 65,000km through all oceans -plates that move in two different directions -ridges move slower than rises and so they spread up more, whereas rises grow out more -trenches : occur at major subduction zones -associated with island arc systems -majority of trenches are in Pacific 2) Know the five primary classifications of ocean sediments. -1- sources -2-areas of deposits -3-particle size -4-age -5-color 3) Distinguish between lithogenous, biogenous, hydrogenous and cosmongenous sediments. -lithogenous : from rocks -hydrogenous : from chemical processes -biogenous : from remains of living organisms -cosmongenous : from outer space
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4) How do lithogenous sediments end up in the ocean?
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