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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Rocks that were formerly part of Laurentia are now mostly in ____
a. North America b. South America c. Europe
d. Africa e. Antarctica
U.S. population reached 300 million by the year 2000
Indicate whether the statement is true or false
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)