Describe the features and characteristics associated with each stage in the evolution of a mountainous desert
What will be an ideal response?
A mountainous desert is formed by tectonics driving fault-block mountains up and interior basins between them down. During and after this uplift, streams erode the mountains and bring sediment into the basins, gradually diminishing landscape relief. The streams deposit the sediment in alluvial fans that overlap and form bajadas at the foot of the mountains. When there is greater rainfall, the streams will form a shallow pool in the basin known as a playa lake. When this water evaporates, it leaves behind evaporite mineral deposits, forming a salt flat. With the ongoing erosion of mountains and filling of interior basins, gradually all that is left are rounded remnant knobs of bedrock in a sea of sand, which are called inselbergs.
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Which of the following statements accurately describes the action of ozone?
A. It reflects UV radiation back into space. B. It reflects heat back into space. C. It absorbs UV radiation and undergoes fragmentation. D. It emits UV radiation when excited by sunlight. E. none of the above
Oral rehydration therapy
a. is less successful than expected b. is too expensive to be practical c. was a factor in saving about 3 million lives in 2008 d. can help prevent death by dehydration of a child with severe diarrhea e. None of the above
Describe the Younger Dryas period, the evidence for its existence, and the hypothesis for its origin
What will be an ideal response?
Freshwater passing through uplifted sediments containing quick clay changes the sea salt content leaving quick clay with all but which of the following?
A. water contents commonly in excess of 50 percent B. grains mostly less than 0.002-mm diameter C. a higher salt content D. weak structure