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What term refers to the erosional plain formed at the base of the surrounding mountain scarps in desert depressions?
  • a)
    Bajada
  • b)
    Pediment
  • c)
    Alluvial fan
  • d)
    Dry delta
Correct answer is option 'B'. Can you explain this answer?
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What term refers to the erosional plain formed at the base of the surr...
Pediment is an erosional plain formed at the base of the surrounding mountain scarps in desert depressions. It is characterized by steep slopes and is often found alongside Bajada, which is a depositional feature made up of alluvial material.
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Milankovitch proposed in the early twentieth century that the ice ages were caused by variations in the Earth’s orbit around the Sun. For some time, this theory was considered untestable, largely because there was no sufficiently precise chronology of the ice ages with which the orbital variations could be matched. To establish such a chronology, it is necessary to determine the relative amounts of land ice that existed at various times in the Earth’s past. A recent discovery makes such a determination possible: relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments. Almost all the oxygen in water is oxygen 16, but a few molecules out of every thousand incorporate the heavier isotope 18.When an ice age begins, the continental ice sheets grow, steadily reducing the amount of water evaporated from the ocean that will eventually return to it. Because heavier isotopes tend to be left behind when water evaporates from the ocean surfaces, the remaining ocean water becomes progressively enriched in oxygen 18. The degree of enrichment can be determined by analyzing ocean sediments of the period, because these sediments are composed of calcium carbonate shells of marine organisms, shells that were constructed with oxygen atoms drawn from the surrounding ocean. The higher the ratio of oxygen 18 to oxygen 16 in a sedimentary specimen, the more land ice there was when the sediment was laid down.According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?

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What term refers to the erosional plain formed at the base of the surrounding mountain scarps in desert depressions?a)Bajadab)Pedimentc)Alluvial fand)Dry deltaCorrect answer is option 'B'. Can you explain this answer?
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