A fictional vision of a more environmentally healthy planet in the future uses which of the following fuels and renewable energy resources?
a. underground heat only
b. algae only
c. sun and wind only
d. flowing water only
e. underground heat, algae, sun and wind and flowing water
E
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If an element has 18 protons, 20 neutrons, and 18 electrons, which expression correctly identifies the element?
A. argon-18 B. calcium-38 C. argon-20 D. calcium-20 E. argon-38
Someone argues that he or she doesn't drink tap water because it contains thousands of molecules of some impurity in each glass. How would you respond in defense of the water's purity, if it indeed does contain thousands of molecules of some impurity per glass?
A. The water contains water molecules and each water molecule is pure. B. Compared to the billions and billions of water molecules, a thousand molecules of something else is practically nothing. C. There's no defense. If the water contains impurities, it should not be drunk. D. Impurities aren't necessarily bad, in fact, they may be good for you.
Clouds can decrease the range of daily temperatures because ________
A) the clouds reflect solar radiation back into space during the day B) the clouds store heat and that helps to maintain a uniform temperature at night and during the day C) the clouds diffuse the solar radiation so it is spread out over a larger area D) the water vapor absorbs the heat from the earth and sends reflects it back to the ground maintaining a uniform ground temperature during the day
Uniformitarianism was an idea first put forth by the scientist ________
A) Wegener B) Köppen C) Hutton D) Berkeley E) Aristotle