The tropical Sahel region is particularly vulnerable to drought, but its ecosystems have mechanisms to cope and recover from this stress.What terms describes the ability of Sahel regions to cope through drought cycles?
a. tropical swing shifts
b. de-persistence
c. retoleration
d. desertification
e. resilience
e
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Examine these atomic models and answer the question that follows. The filled black circles represent electrons. (Note: Electrons and nucleus are not drawn to scale.)Assuming that the number of electrons is the same as the number of protons (which is not always the case), which picture represents the atom of carbon that has an atomic number of 6?
A major danger of soils that become too acidic is that
A) solifluction becomes a bigger danger. B) soils can become calcified more easily, especially in coastal environments. C) the harmful effects of heavy metal pollutants become magnified. D) crops that grow on them become more sensitive to cold temperatures.
Sweating cools people because:
A) it releases latent heat. B) it changes the heat capacity of the body. C) colder molecules in a passing wind adhere to the wet skin. D) it involves a transfer of sensible heat.
What is a characteristic of the water that is expelled from hydrothermal vents?
A) The water is more acidic than normal sea water. B) The water is enriched with metals. C) The water has higher concentrations of dissolved gases. D) All of these choices are true.