Which of the following are the two greatest long-term threats to coral reefs?
A. ocean acidification and overfishing
B. damage by divers and predation
C. climate change and acidification
D. erosion and sea-level rise
E. climate change and predation
Answer: C
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Upon which is the force of gravity greater?
A. A 1-kg iron ball. B. A 1-kg block of wood. C. A 1-kg sack of feathers. D. all of the above
Which statement describes the polar front jet stream??
a. ?It is strongest in summer. b. ?It moves farther north in winter. c. ?It forms near the boundary called the polar front. d. ?It is normally found at a higher elevation than the subtropical jet. e. ?It has lower wind speeds than the subtropical jet stream.
A translational slide involves
A) a mudflow. B) movement of surface material along a planar (flat) surface. C) creep. D) unconsolidated flow of material. E) rotational movement of surface material.
During an El Niño, upwelling of cool waters along the west coast of South America is intensified
Indicate whether the statement is true or false