Downbursts from a thunderstorm ____
a. ?create high surface winds that extend in every direction from the center of the burst
b. ?are a hazard to air traffic but dissipate before reaching the ground
c. ?can only form from pockets of cold, dry air
d. ?are most common on the trailing edge of a thundercloud
e. ?are a wind effect that is not linked to rainfall
ANSWER: a
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Differential movement on faults has produced uplifted blocks called ____ and down-dropped blocks called ____
A)domes; basins B)strike faults; dip faults C)dip faults; strike faults D)grabens; horsts E)horsts; grabens
What influences the shape of the cone of depression?
A) the rock type and the depth of permeability B) the elevation of the aquifer compared to the well depth C) balance between pumped water and ground-water flow toward well D) the size of the aquifer
What is NOT a way in which development affects floods?
a. pavement and rooftops increase runoff b. excavation of sand and gravel changes river sediment loads c. artificial concrete channels minimize floods d. logging increases runoff e. logging decreases sediment loading
Under the surface of the Earth, where would one expect a convection current directed toward the surface?
A) under continents B) under subduction zones C) in the core D) under mid-ocean ridges E) under plates