Metamorphic rocks ____
a. form when molten rock comes in contact with the atmosphere
b. often form depositional layers called bedding planes
c. are usually softer and less resistant to weathering than sedimentary rocks
d. are metamorphosed
e. include the rocks obsidian and conglomerate
d
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Which of the following gives the most important reason why summers in the Southern Hemisphere are cooler than summers in the Northern Hemisphere?
A. Over 80 percent of the Southern Hemisphere is covered with water. B. The Earth is closer to the sun in January. C. The Earth is farther from the sun in July. D. The sun's energy is less intense in the Southern Hemisphere.
Ozone depletion is caused by ____.
A. chlorofluorocarbons (CFCs) in the troposphere B. chlorofluorocarbons (CFCs) in the stratosphere C. global warming D. the greenhouse effect E. cold air in the polar regions
Permanently frozen subsoil characterizes
A. chaparral. B. tundra. C. coniferous forests. D. temperate grasslands.
Which of the following is true of the alcohol functional groups in 1,3-propanediol?
A) One is primary and one is secondary. B) One is primary and one is tertiary. C) Both are primary. D) Neither is primary.