Why is it usually difficult to maintain productive agriculture year after year in a cleared area of tropical rainforest?
What will be an ideal response?
Answer: The nutrients of rainforest are held in the natural vegetation. Once the forest cover is removed or the cover burned for agriculture, the nutrients quickly leach out of the soil and the soil becomes infertile.
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Which of the following ethnicities is prominent in Afghanistan?
A) Armenian B) Chinese Han C) Berber D) Quetchua E) Pashtun
Most plutons form ____
A)well within plates B)from extruded lava C)from batholiths D)above the land surface E)at convergent plate boundaries
Irregular heating of the air can produce thermals, which are ________
A) pockets of cold air that sink B) pockets of warm air that rise C) pockets of warm air that sink D) pockets of cold air that rise
What type of fault would you expect to find at a transform plate boundary?
A. Reverse B. Strike-slip C. Normal