When liquid water gets below 4°C, it ____
A) ?forms a gas by breaking all of its hydrogen bonds
B) ?behaves like all other liquids and increases in density
C) ?begins to decrease in density by expanding
D) ?compresses its molecular structure and becomes more saline
C
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The majority of the oil pollution in the ocean comes from
A. blowouts (rupture of a borehole of an oil rig in the ocean). B. tanker accidents. C. fisheries. D. runoff from land. E. normal operation of offshore wells.
What happens when a glacier encounters the sea or a lake?
A) The ice is denser than water and so scrapes along the bottom. B) White icebergs float but blue icebergs sink to the bottom. C) Large blocks of ice collapse off the front of the glacier and become icebergs. D) Rocks released from melted icebergs float on the water surface. E) All of these are correct.
?Life raft ecosystems are areas with high poverty levels and where most people depend on ecosystem services for survival.
Answer the following statement true (T) or false (F)
An accretionary prism of sediments and oceanic crust is formed
A. on top of the oceanic plate that is not being subducted. B. in an oceanic trench created by the subduction of one oceanic plate beneath another plate. C. in the asthenosphere as the subduction of one oceanic plate enters the asthenosphere.