Which type of physical weathering involves the removal of overlying materials?
A. mineral growth
B. wedging
C. unloading
D. abrasion
Answer: C
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Which of the following is the best example of a hygroscopic nucleus?
a. microscopic dust b. pollen c. sea salt d. smoke
Which of the following gives the most important reason why summers in the Southern Hemisphere are cooler than summers in the Northern Hemisphere?
A. Over 80 percent of the Southern Hemisphere is covered with water. B. The Earth is closer to the sun in January. C. The Earth is farther from the sun in July. D. The sun's energy is less intense in the Southern Hemisphere.
The age of the Burgess Shale is
a. Upper Proterozoic. d. Upper Cambrian. b. Middle Cambrian. e. none of the above c. Lower Cambrian.
Platyhelminthes were the first organisms to have ____
a. a fully developed brain b. a notochord c. a central nervous system d. metamerism e. an excretory system