Satellite radar altimeters measure sea surface topography.
Answer the following statement true (T) or false (F)
True
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At about what frequency is Earth struck by a meteorite large enough (about 10 km in diameter) to cause mass extinctions?
A. about every 100 million years B. about every 10 million years C. about every 1 million years D. This has yet to occur on Earth.
The majority of human population growth is now occurring in
A) less-developed countries (LDCs). B) more-developed countries (MDCs). C) evenly between LDCs and MDCs. D) neither LDCs or MDCs; world populations are declining.
Which biome lacks trees, has widespread permafrost, and is the coldest on Earth?
a. tundra b. cryosphere c. temperate d. taiga e. xeric shrublands
Which of the following did not exist prior to the Quaternary Ice ages?
A) Antarctica B) the arctic ocean C) the Colorado River D) the Great Lakes E) the Mississippi River