Instructions: Choose one answer from each pair of selections. Do the chlorofluorocarbons (CFCs) in the atmosphere come from NATURAL or SYNTHETIC sources?
SYNTHETIC
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Which of the following images could describe an element at the atomic level?
A. 
B. 
C. 
D. none of the images
E. all of the images
You and your friend journey to the mountain foothills to get closer to nature and escape such things as radioactivity. While bathing in the warmth of a natural hot spring she wonders aloud how the spring gets its heat
What do you tell her? You tell her that the hot water is the result of A) industrial thermal pollution. B) radioactivity. C) chemical reactions involving the atomic nucleus. D) nuclear fission.
The most violent volcanic eruptions are found at ________
a. convergent plate boundaries b. divergent plate boundaries c. transform plate boundaries d. hot spots
Limestone consists of rock made from ____
a. ?carbon dioxide b. ?carbonic acid c. ?sodium bicarbonate d. ?calcium carbonate e. ?carbon silicate