About 55 million years ago, climate warmed. According to one model, surface water evaporated, and the salinity of seawater __________. This water __________ and __________ methane hydrates on the sea floor, leading to a/an __________ in global temperature.
A) increased, sank, melted, increase
B) decreased, sank, melted, increase
C) decreased, floated on the surface, melted, increase
D) increased, sank, froze, decrease
Correct Answer:
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Q20: The Sun produces energy by _ _.
Q21: Rapid plate movement and sea-floor spreading cause
Q22: Carbon exists in the atmosphere mostly as
Q24: During photosynthesis:
A) carbon dioxide, which is a
Q26: Which of the following statements about climate
Q27: Water molecules containing 16O are _ and
Q28: The most useful of the methods listed
Q29: The four industrial greenhouse gases are:
A) carbon
Q30: Since the Earth formed, solar energy output:
A)
Q39: Which of the following is a greenhouse
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