How much have humans increased the annual extinction rate compared to the background rate before modern humans appeared?
A. 1000 times
B. 10 times
C. No change
D. Doubled it
Answer: A
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What types of geologic evidence support the Snowball Earth model for the Late Precambrian glaciations?
What will be an ideal response?
The most accurate terms describing the trend over the past 50 years for human use of natural resources are ________
A) steady state, no change B) rapidly increasing, moving from unsustainable to sustainable C) from unsustainable to sustainable D) increasing and unsustainable E) decreasing and sustainable
Why was the irrigation of Soviet cotton farming operations a problem?
A) Irrigation water came from rivers feeding into one of the largest lakes on Earth and resulted in major contamination of that source. B) It was, for the most part, not a problem. C) It drained the Aral Sea and increased the salt content of soils. D) There was governmental opposition that limited water access, killing crops. E) It angered local resort communities, which did not want farming in the region.
Restoration draws on which of the following fields of science the most?
A. Hydrology B. Soil science C. Ecology D. Ecology and hydrology E. All of these are correct