The transition between the shelf and the deep seafloor is the ____
A) littoral zone
B) continental slope and rise
C) abyssal plain
D) mid-ocean ridge
B
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Solar energy is becoming more popular recently due to
A. the decline of nuclear power after Fukushima. B. the decreased abundance of natural gas in the United States. C. new technology and the lower cost due to subsidies and tax breaks. D. conflict in the Middle East over oil supplies. E. the rising temperature of the atmosphere.
What carved this U-shaped valley?
A) A rapidly downcutting river
B) A slowly downcutting river
C) Wind
D) Glacier
What is the principle of cross-cutting relationships? What will be an ideal response?
Organisms contribute to soils formation by ________
A) stirring the soil to allow air infiltration B) degrading organic matter to form humus C) contributing organic matter to the soil D) all of the above