Extinctions that occur at a moderate rate and continuously open a limited number of opportunities for the origin of new species and new niches are known as ________ extinctions.
A. retrograde
B. mass
C. minimal
D. background
Answer: D
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The Columbia River volcanic field can be described as ____
a. andesitic stratovolcanoes b. voluminous basalt lava flows c. voluminous rhyolite tuff eruptions d. granite batholiths e. layered mafic intrusions
The Lebanese civil war resulted when the country broke down because of
A) ethnic groups. B) religious groups. C) changes in the majority between religious groups. D) independent armies. E) famine.
Which of the following associations is CORRECT?
A) stratosphere — coldest temperatures in the atmosphere B) mesosphere — begins at a height of 50 km C) troposphere — positive lapse rate D) thermosphere — high heat
The spacing of isobar lines on a map provides a visual indication of ________
Fill in the blank(s) with correct word