Which statement about cones of depression is true?
A)They form when water inflow exceeds water withdrawal.
B)They affect large regions and have extensive economic impact.
C)They lower the water table around a well.
D)They only form immediately after a well is drilled.
E)They get narrower closer to the well head.
Question 2Volcanic bombs have a twisted, streamlined shape, which indicates that they ____.
A)cooled quickly underwater
B)were formed from ropy, viscous mafic flows
C)were erupted as globs of magma that cooled and solidified during their flight through the air
D)have high amounts of dissolved gases and low amounts of sodium
E)were erupted gently from a shield volcano and cooled as they moved downslope
Question 3What two processes, which began during the Archean, can account for the introduction of free oxygen into the atmosphere?
Question 4Artesian wells flow freely when the ____.
A)wellhead is below the zone of aeration
B)wellhead is above the zone of aeration
C)wellhead is below the artesian pressure surface
D)wellhead is below the artesian pressure surface
E)artesian aquifer experiences subsidence
Question 5Pillow lava forms when ____.
A)lava is rapidly chilled underwater
B)lava cools slowly on land
C)pyroclastic volcanic ash is consolidated
D)lava is ejected from a lava tube
E)a pahoehoe flow cools and becomes an aa flow
Question 6What is the first supercontinent recognized with some certainty, and when did it begin fragmenting?
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