Why are gas hydrate deposits abundant in submarine continental margins?
a) Organic marine sediments provide natural gas in which pressure is high and temperature is low.
b) There is plenty of water to form the ice-like compound.
c) Gas hydrate forms in surface water offshore of continents where it sinks to the ocean bottom.
d) The ocean contains abundant bacteria, which form the natural gas needed for gas hydrate.
e) The ocean shields the gas hydrate from warming by the Sun, which would cause it to dissolve.
A
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Paleozoic and Mesozoic marine invertebrate faunas differ primarily because ____
a. mammals had not yet evolved in the Paleozoic b. birds had not yet evolved in the Paleozoic c. most Paleozoic faunas were nektonic d. Mesozoic fauna with hard and soft parts burrowed in the sediment e. more Mesozoic fauna were nektonic
A deposit of sediment where a stream or river enters a lake or the ocean:a
alluvial fan d. tidal flat b. braided stream e. delta c. dune
Europe, England, and Canada account for over two-thirds of all biotechnology crops planted globally.
Answer the following statement true (T) or false (F)
Which of the following is a hollow steel tube with a heavy weight on top that is to collect sediment samples?
A) Dredge B) Gravity corer C) Long line D) Rotary corer E) Seiche disk