Commonly, materials flowing out of hot springs build a ________
A) dome
B) sinkhole
C) geyser
D) cavern
E) doline
Answer: A
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When you set a pot of tap water on the stove to boil, you'll often see bubbles start to form well before boiling temperature is ever reached. Explain this observation.
A. These are dissolved salts heating up and escaping from the water. B. They are very minute pockets of water in the gaseous phase. When they get large enough, the water will boil as this gas escapes. C. These bubbles are formed as the surrounding gases from the air dissolve into the water as it is heated. D. These initial bubbles are the gases that were dissolved in the water coming out of solution. The solubility of gases in water decreases with increasing temperature.
Which one of the following is a major cause of global topsoil loss?
A) Erosion via water and wind B) Rising ocean levels C) Construction of new buildings and roads D) Creation of new mines
Which of the following is not a system?
A) the Pacific Ocean and the west coast of North America B) the study of minerals C) soil, plants, rock, soil organisms, and animals D) the biosphere
The role of the United Nations is to ________
A) make international laws regarding commerce and the environment B) maintain international environmental education standards C) regulate international travel, emigration, and immigration among member states D) help resolve international economic, social, cultural, and humanitarian problems E) develop international business cooperatives