In a(n) ____ bond, elements share electrons
a. ionic
b. van der Waals
c. electromagnetic
d. covalent
e. noble
d
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A bird on a high-voltage wire isn't shocked because
A. of low conductivity. B. of high insulation. C. of high resistance between its feet. D. none of the above
Which of the following statements is true regarding keystone species?
a. Animals can be keystone species, but plants cannot. b. Top predators can be keystone species, but other animals cannot. c. Insects can never be keystone species because they are pests. d. Some keystone species are more vulnerable to extinction than other species. e. A species must have a very large population size in order to be a keystone species.
________ is formed when carbon dioxide dissolves in rainwater, and this mildly reactive substance aids chemical weathering
A) Carbonic acid B) Hydrochloric acid C) Clay D) Limestone
Ephemeral streams ________
A) are a major agent of erosion in desert regions B) are a major agent of erosion in areas of ground moraine C) flow all the time D) are limited to rainshadow deserts