Of the total solar energy reaching the Earth, ________ percent is fixed by photosynthesis
A) 80
B) 40
C) 20
D) 10
E) less than 1
Answer: E
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U.S. population reached 300 million by the year 2000
Indicate whether the statement is true or false
Rocks that were formerly part of Laurentia are now mostly in ____
a. North America b. South America c. Europe
d. Africa e. Antarctica
When clay minerals in a shale are subjected to elevated temperature and pressure, they may change in the solid state (that is, without melting) to form platy minerals like ________ that are at equilibrium with the new temperature/pressure conditions.
A. carbonate B. mica C. amphibole D. pyroxene E. feldspar
What you choose to buy as a consumer does not really influence businesses to produce eco-friendly goods and services.
Answer the following statement true (T) or false (F)