Earthquakes result from the sudden release of elastic strain energy previously stored in rocks surrounding a zone of fault movement.
a. true
b. false
Answer: a. true
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The approximate altitude of auroral displays is:
A) above 500 km. B) above 1000 km. C) 80-400 km. D) below 30 km. E) about 50 km.
A strong negative index for the North Atlantic Oscillation (NAO) usually means that there is ________ of a pressure difference between the Bermuda (subtropical) high and the Icelandic low pressure. This brings ________ than average temperatures over the northern U.S. and northwest Europe
A. less, cooler. B. greater, warmer. C. greater, cooler. D. less, warmer.
Briefly explain how a stream might adjust toward an equilibrium state following a heavy rain. What will be an ideal response?
Which of the following can be caused by overpumping of groundwater?
A. the destruction of an aquifer B. land subsidence C. a change in the flow direction D. All of these can be caused by overpumping.