The atmosphere surrounding Earth can be subdivided into 4 layers: troposphere, stratosphere, mesosphere, and thermosphere.
a. true
b. false
Answer: a. true
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The generation of alternate fuels from manure and cellulosic waste products
A) increases our consumption of fossil fuels. B) reduces costs to a company by using waste products. C) increases the production of commercial waste products. D) eliminates the production and release of carbon dioxide into the atmosphere.
Which remote sensing system is used to measure land surface elevations?
a. thermal infrared b. lidar c. aerial photographs d. near-infrared e. ultraviolet (UV)
Why do the planets "drift" east relative to the stars and then move west for periods of time?
A) They are moving in the same rotation sense as the earth around the sun, but as the earth moves faster (or slower, depending on the planet) the motion appears to be backwards. B) They are moving in large elliptical orbits, so when observed from Earth, their motion changes depending on whether they are near or far from the sun at a given time. C) They are moving in separate orbits around the sun as it goes around the earth, producing the periodic backtracking. D) They don't move, they stay fixed relative to the stars.
A major comet or meteorite impact occurred in Mexico at the time boundary between the ________.
A. Pleistocene and Pliocene B. Pliocene and Miocene C. Cretaceous and Tertiary D. Precambrian and Cambrian E. Jurassic and Cretaceous