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.
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Species that live a long life and have only a few offspring, such as humans, can be characterized as
A) K-selected. B) r-selected. C) autotrophs. D) omnivores.
A radioactive isotope of element X (which is the parent isotope) is discovered in different amounts in four rocks. Which rock is oldest?
- 15% of element X remains in Rock A
- 28% of element X remains in Rock A
- 57% of element X remains in Rock A
- 75% of element X remains in Rock A
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
Indicate whether the statement is true or false
This volcano is broad and low, and is composed of basaltic lava flows. What kind of volcano is it?
A. caldera B. scoria cone C. volcanic dome D. shield volcano E. composite volcano