About 50 percent of North American tornadoes are classified as violent (EF4-EF5)
Indicate whether the statement is true or false
FALSE
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A softball is tossed upward with 100 J of kinetic energy in the presence of air resistance. When the ball returns to its initial level its kinetic energy is
A. less than 100 J. B. 100 J. C. more than 100 J. D. need more information
How well pores are connected to allow groundwater flow is known as _____.
a.) permeability b.) porosity c.) aquifer d.) aquitard
Why do hot spots form a trail of extinct volcanoes over time?
A) The mantle plume moves with Earth's rotation. B) The tectonic plates that contain the volcanoes move over time. C) The heat and debris from the eruptions are enough to form nearby islands. D) The mantle-plume hypothesis assumes the hot plumes are wedge-shaped.
Refraction causes bays, near headlands, to be areas of ________ surfing and sites of ________
A) good; deposition B) good; erosion C) poor; deposition D) poor; erosion