Crater Lake, Oregon, is an example of a volcanic _______.
a - neck
b - peak
c - caldera
d - batholith
e - lava flow
c - caldera
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How can you tell whether a sugar solution is saturated or not?
A. There will be a precipitate if the water is heated. B. As long as there are more water molecules than sugar molecules, there is a saturated solution. C. Add more sugar; if it dissolves, it is saturated. D. Cool the solution to see if there is a precipitate.
Explain why the stratosphere is an inversion layer.
What will be an ideal response?
Building tall smokestacks may improve local air quality
Indicate whether the statement is true or false
In the last two or three centuries birthrates ________.
A. have skyrocketed, while death rates have plunged B. and death rates remained flat C. and death rates have plunged D. have changed little, while death rates have plunged E. and death rates have skyrocketed