Of the following anions, which almost always forms soluble compounds?
A) NO3-
B) OH-
C) SO42-
D) all of these
A
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Which of the following statements is true regarding sound in the ocean?
A) Sound is scattered as it bounces off suspended particles in the water. B) Sound intensity increases as it moves through the ocean because of absorption. C) The speed of sound in the ocean is ten times less than the speed of sound in air. D) The speed of sound in the ocean decreases as temperature increases.
Industrializing and rapidly modernizing countries most often require
a. student activists. b. mass education of the people. c. more solar radiation. d. stronger religious organizations. e. a return to a more sedentary lifestyle.
At one time the earth's atmosphere contained no free oxygen
Indicate whether the statement is true or false
Mt. Rainier in Washington State is often thought to be the most hazardous volcano in the lower 48 states of the United States because ________
A) large amounts of glacial ice on the mountain could be melted by even a small eruption, potentially generating dangerous lahars that would travel rapidly down river valleys to heavily populated areas B) the volcano is close enough to Seattle and Tacoma, Washington that a large explosive eruption could bury the cities in a large rock avalanche similar to the Mt. St. Helens eruption C) it is close enough to Seattle and Tacoma, Washington that these cities could be destroyed in a pyroclastic flow D) The statement is false; the volcano poses little hazard to humans except for the few who live close to the volcano.