Present carbon dioxide levels in the atmosphere are higher now than any time in the last 800,000 years
Indicate whether the statement is true or false
TRUE
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Small areas, ranging from square meters to square kilometers, with climates that are different from the region around them are called
A) ravines. B) macroclimates. C) proxies. D) niches. E) microclimates.
The ________ drives the endogenic processes of the rock cycle
A) atmospheric circulation B) rock cycle C) hydrologic cycle D) tectonic cycle
According to the theory of organic evolution, all living organisms are related and they descended, with some modifications, from organisms that lived in the past.
a. true b. false
Nitrate in groundwater can be increased by infiltration of runoff from all of the following except
A. fields treated with synthetic fertilizers containing nitrogen. B. glacial melt. C. manure from cattle feedlots. D. sewage-treatment waste water.