If a sound pulse is sent vertically downward into the sea and its reflected echo from the seafloor returns 6 seconds later, the depth of the water is ________ meters. (The average speed of sound in seawater is 1500 m/sec.)
A. 3000
B. 9000
C. 6000
D. 4500
E. 12,000
Answer: D
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A. cold-type occluded front B. warm-type occluded front C. cold front D. warm front
Plate tectonic processes can affect climate
Indicate whether the statement is true or false
NADPH is needed for the synthesis of which of the following?
A) amino acids B) cholesterol C) unsaturated fatty acids D) all of these
What is balkanization? Give one example of how it has occurred in Europe