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flanking mountains have moved apart. Thus, in the past the valley was narrower and shallower than it is now, and the motions have deepened and widened the valley.Correct Answer(s):DTable for Individual Question FeedbackPoints Earned:1.0/1.03.
The picture above shows river gravels in the bottom of Death Valley. Based on the lesson materials for this unit, a likely explanation for this occurrence of river gravels in the valley bottom is:Table for Individual Question FeedbackPoints Earned:1.0/1.0
4.Geophysical evidence indicates that convection is occurring in the Earth’s mantle. What isthe most likely physical explanation for why convection can occur in the mantle?