People think biofuels (wood, switchgrass, etc.) are "better" than coal because _______.
Fill in the blank(s) with the appropriate word(s).
Answer: coal burning increase carbon dioxide in the atmosphere
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In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn + 2 OH- ? ZnO + H2O + 2e- rxn B: 2 MnO2 + H2O + 2e- ? Mn2O3 + 2 OH- What is undergoing reduction?
A) Zn B) ZnO C) MnO2 D) H2O E) OH-
Geologists have not studied the composition of the oceanic crust by
A) dragging buckets along the floor to collect sediment and rocks. B) studying the contents of drill holes. C) examining aboveground mountain ranges. D) analyzing earthquake data.
The rising tide is also known as the ____________________ tide. The falling tide is known as the
____________________ tide. Fill in the blank(s) with the appropriate word(s).
Americans generate ________ metric tons of plastic waste each year
a. 34 billion b. 34 million c. 100 million d. 10 million