How close must a fire engine get to a static water source to be able to draft directly from it through hard suction hose?

a. 10 ft.
b. 20 ft.
c. 30 ft.
d. a distance equal to the total length of the available hard suction hose minus 10 ft.


Answer: b. 20 ft.

Environmental & Atmospheric Sciences

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Species that live a long life and have only a few offspring, such as humans, can be characterized as

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A radioactive isotope of element X (which is the parent isotope) is discovered in different amounts in four rocks. Which rock is oldest?

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  4. 75% of element X remains in Rock A

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There is evidence that some of the organisms that went extinct at the end of the Cretaceous were already beginning to decline in population strength

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