The expansion of desert lands and noncultivable regions by overuse, overpopulation and drought is ________
Fill in the blank(s) with correct word
desertification
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In tropical rainforests, vegetation layers are structured according to
a. how deep the rainfall penetrates into the forest b. the plant's needs for sunlight c. how well each plant handles predation by herbivores d. nutrient availability and uptake by plant roots e. tropical rainforests are not layered
The city with the worst air pollution problems in Mexico is
A. Guadalajara B. Mexico City C. Acapulco D. Cancun
What are the types of symbiotic relationships that organisms exhibit? Give examples of each. What will be an ideal response?
The common source of pressure during compaction of sediments is ________
A) the weight of the compacting sediments causing internal pressure B) the pressure of the sediments pushing the compacting sediments out of the way during deposition C) the weight of water above the sediments after they are deposited D) the weight of the sediments deposited above the compacting sediments