Which of the following is evidence that Earth's history is not short?
A. rates of seafloor spreading compared to the width of the Atlantic Ocean
B. thousands of isotopic ages measured by different methods
C. millions of layers of light- and dark-colored sediment that record yearly cycles
D. a 4-billion-year age on a rock in Canada
E. All of these choices are correct.
Answer: E
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The type of volcanic eruption shown in this photograph is
A) a lava fountain.
B) collapse of a volcanic dome.
C) a fissure eruption.
D) a pyroclastic column.
E) a volcanic mudflow.
What is environmental resistance?
A) The decline in population growth B) The effect of limiting factors on the environment C) The maximum population growth in an environment D) All of these choices
Of the following clouds, which is typically found at the lowest elevation?
A) cirrocumulus B) altocumulus C) cirrus D) altostratus E) stratocumulus
When El Niño occurs every three to five years, a mass of warm Pacific water that is usually pushed westward by trade winds
A. Surges back eastward toward South America B. Becomes much warmer than usual, strengthening trade winds C. Surges northward toward Japan D. Cools dramatically E. Sinks and therefore cools substantially