How do geologists find the relative ages of rocks that are found far apart?
What will be an ideal response?
Answer: The principle of lateral continuity states that sedimentary beds are continuously deposited over large areas until some sort of barrier limits deposition. The principle of faunal succession states that fossils found in rocks change through time as some species become extinct and new ones appear. Each species of organism has a limited time interval of existence. Fossil-bearing rocks are placed in relative age order by determining the interval of geologic time represented by the fossils that the rocks contain.
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What is the coefficient of sliding friction and what is a representative value for this coefficient for the brittle crust?
What will be an ideal response?
Biological treatment of hazardous waste may involve ________ hazardous substances.
A. Special organic chemical processing of B. Using bacteria and plants to absorb and detoxify C. The genetic alteration of species suffering from D. Using microorganisms to disperse E. None of these is correct
Figure 3.15 Generalized pyramid of energy flow showing the decrease in usable chemical energy available at each succeeding trophic level in a food chain or food web.
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Use the accompanying figure to answer the following five questions.
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What group is indicated by letter E, to which all organisms in the pyramid eventually succumb?
What will be an ideal response?
Unlike a stream-cut valley that assumes a characteristic __________-shape, a glacially-carved valley evidences a characteristic __________-shape.
A) U; V B) V; U C) flat; rounded D) steep; shallow