Water penetrating into soil promotes chemical weathering by acting as a weak _____.
a - base
b - catalyst
c - neutral agent
d - acid
e - saline solution
d - acid
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Which of the following nonhuman-related causes has most likely contributed the most to the increase in malaria in Africa?
A) increased difficulty in treating malaria with antibiotics B) growing urban populations C) increased insecticide resistance D) increased vulnerability of HIV-infected humans to malaria E) less money for mosquito abatement programs
Which of the following is true of the reaction: O2(g) ? 2 O(g)?
A) It is endothermic. B) It is exothermic. C) It is neither endothermic nor exothermic. D) None of these, the reaction cannot occur.
With the outbreak of World War II, the residents of Melanesia quickly repelled Japanese advances and maintained control of their islands
Indicate whether the statement is true or false
The total length of channels within a drainage basin in relation to total area is called _____
a. stream order b. drainage density c. stream capacity d. stream discharge e. stream gradient