What are the three most valuable marine resources? How are they excavated from the ocean? Are these
resources renewable or nonrenewable? What will be an ideal response?
ANS:Answer
should include:
? The most valuable resource in the ocean and on land is crude oil and natural gas. These
are nonrenewable resources made from organisms that broke down into simple
carbohydrates over time in areas with low oxygen levels.
? Oil is excavated by drilling. Most of the oil platforms are relatively near to the shore.
The deeper the drilling, the more difficult and costly it becomes.
? Sand and gravel are the second most valuable resources. Solid deposits are considered to
be nonrenewable. Sand can be suction-dredged onto temporary islands before being
shipped to various locations worldwide.
? The magnesium and magnesium compounds are the third most valuable resource the
ocean has to offer. These can be collected by using chemical reactions or electricity. The
magnesium is extracted from the brine.
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Why is clay poor soil?
A. Clay particles pack so tightly there is little air in clay soil. B. It does not contain organic matter. C. It doesn't allow sufficient drainage. D. all of the above
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Answer the following statement true (T) or false (F)
Compare the three main types of galaxies
What will be an ideal response?