Which of the following is not an advantage of solar cells?
a. durable for 20 to 25 years
b. moderate net energy yield
c. easy expansion as needed
d. little or no carbon dioxide emissions
e. works the same in all areas of the planet
E
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Fossil fuels currently supply about 50 percent of the world's commercial energy supplies.
Answer the following statement true (T) or false (F)
What is one reason diatomaceous earth is economically valued?
a. It can be used as a fossil fuel alternative. b. It can be used for various filtration systems. c. It can be broken up for gravel and used as building materials. d. It demonstrates the presence of "marine snow."
The ____ is a vast sampling network of nearly 4,000 independently drifting sensors
A) ?Argo system B) ?chemical tracer C) ?drift bottles D) ?echo sounders
Tree cover created or retained by human beings is called a(n) ________ forest
A) Terrace B) Jati C) Transhumance D) Naxalite E) Anthropogenic