Gemstones are precious minerals used for decorative purposes
a. True
b. False
True
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Active solar energy systems involve
A. Large volumes of massive heat absorbers B. Stationary materials to gather and hold heat C. Photovoltaic cells D. Pumps and moving fluids E. Cogeneration
Pangaea is ____________.
a) another name given the Alaskan earthquake of 1964 b) a portion of the mid-Atlantic ridge c) a German word for "plate tectonics" d) the name of a supercontinent meaning "All Land" e) all of the above
Which of the following represents an alarming positive feedback loop of global warming?
A) Increasing temperatures raise humidity, which further increases temperatures. B) Decreased pH of the ocean increases the rate at which carbon dioxide is absorbed by the oceans from the atmosphere. C) Increased use of fossil fuels adds ozone to the stratosphere, which traps more heat. D) Increased levels of atmospheric carbon dioxide decreases photosynthesis, which further increases atmospheric levels of carbon dioxide.
What is the minimum number of hydrogen atoms present in a carboxylic acid?
A) 1 B) 2 C) 3 D) 4