Earth can be divided into four different spheres. List these spheres and give a description of each
Lithosphere - the surface of Earth, including rocks, soil, and plates
Atmosphere - gases and air surrounding Earth
Biosphere - all living organisms on Earth
Hydrosphere - water (in all forms) on Earth
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The ratio of the number of farmers to the amount of arable land is known as the ________ density
A) physiological B) scientific C) arithmetic D) agricultural E) hypothetical
What is the principal reason that iron and steel are recycled at such a high rate?
A) Iron and steel are highly valuable on the precious metals market. B) The market for steel is large and widespread. C) All sources of iron ore have been more or less exhausted. D) Environmental regulations mandated iron and steel recycling starting in the 1950s.
The Ogallala aquifer is an important resource in:
a. the Sierra Nevada. b. New England. c. Michigan. d. Florida. e. the Great Plains.
A deposit of volcanic tuff contains the isotope potassium-40, which is slowly decaying into argon-40. How might the apparent age of the sample be affected if the volcanic tuff is heated and remains heated for a long period of time?
A) The rate of decay will speed up. B) The sample will appear older than it really is. C) The sample will appear younger than it really is. D) Heat will have no effect on the age of the sample.