3., , The picture at left 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: , A., The valley is deep because it was carved by a river, which later dried up when the desert formed, leaving the gravels behind.B., The valley was paved with gravels by a movie company for a really spectacular stunt in the Dukes of Hazzard movie, involving long-distance car chases and Daisy leaping the boys’ car across the entire park.C., The valley was dropped relative to the mountains by faulting; these gravels had been deposited on mountain tops by rivers before the faulting started, and then the gravels were dropped down by the faulting.D., The valley was dropped relative to the mountains by faulting, and rivers now are carrying gravels down from the mountains into the valley.E., The valley was raised by faulting, bringing up gravels from subterranean caves.Faulting dropped the valley (or raised the mountains, or more likely both), and the melting snows of the mountains feed rivers that carry rocks down into the valley, slowly filling it up while lowering the mountains. There really are deep canyons that were carved by rivers, but as we saw in class and online, Death Valley is not one of them. Rivers don’t run on the tops of mountains to deposit gravels. And Daisy was more into shorts than into long jumps., Points Earned:, 0/1Your Response:, C 4., We believe that convection occurs in the Earth’s mantle because:, A., The Earth’s mantle is completely melted, and melting allows convection.
You've reached the end of your free preview.
Want to read all 8 pages?
- Fall '08
- Earthquakes, Death Valley, Points Earned