A factor that made it difficult for animals to adapt to land was
a. reproduction.
b. desiccation.
c. gravity.
d. extraction of oxygen from the atmosphere.
e. all of the above
E
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A package is dropped by a drone flying at 10 m/s at an altitude of 20 m when directly overhead its receiver. Neglecting the effects of air resistance, the package lands
A. 20 m from the receiver. B. directly beneath the flying drone. C. both of these. D. none of the above
Which of the following is true regarding the solubility of liquids and solids?
A) Solubility always decreases as temperature increases. B) Solubility always increases as temperature increases. C) Solubility usually decreases as temperature increases. D) Solubility usually increases as temperature increases.
Mudflows of volcanic ash are referred to as:
a. talus. b. avalanches. c. heavings. d. solifluctions. e. lahars.
The margins of glaciers are usually darker than the interior primarily because
A. the sides are moving faster than the interior of the glacier. B. shearing causes the ice to expel air and become darker. C. the sides have a higher concentration of rocks and other debris. D. glaciers are transparent so the underlying bedrock is visible. E. All of these choices are correct.