Water that has trickled down into a joint in a rock can freeze, expand, and ________.
A. glue the rock more tightly together
B. widen the crack and hastening the rock's disintegration
C. seal the crack thereby preventing further weathering
D. displace surface acids that may weaken the rock
E. make the rock harder
Answer: B
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When coral expel their own nutrient-supplying algae, a phenomena called ________ often follows
A) massive coral mortality (mcm) B) bleaching C) symbiosis D) coloration
Which one of the following illustrates intraspecific competition?
A) Male red-winged blackbirds defending nesting sites from other males B) A Franklin's gull swooping down to snatch a fish from the water's surface C) A tick and a flea sharing a dog's back D) A butterfly feeding on the nectar of a daffodil flower
Which of the following letters best represents a location where sinking air in a Walker cell is most typical?
A. A B. B C. C D. D
Plates move horizontally past each other along ________.
A. the rift valley B. divergent plate boundaries C. transform faults D. hot spots E. convergent plate boundaries