Ultramafic igneous rocks (those with very high magnesium and iron, and low silica content) may offer the best hope for improving the environment by
A) being placed on the ocean floor, where they can absorb water and reduce global sea levels.
B) absorbing CO2, with their rate of absorption capable of being increased by people.
C) pulling ground-level ozone out of the atmosphere as it cools.
D) reducing the rate of salinization of soils when it is ground into a fine powder and sprinkled on the surface.
B) absorbing CO2, with their rate of absorption capable of being increased by people.
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When you shake fish food into an aquarium, you are contributing to a(n)
A) open system. B) negative feedback system. C) positive feedback system. D) closed system.
Earth is approximately 4.6 billion years old
a. True b. False
What is the difference between a reptile's lower jaw and a mammal's lower jaw?
A)Mammals have 16 teeth in the lower jaw. B)The lower jaw of a reptile is a single bone. C)The lower jaw of a reptile contains no teeth. D)The lower jaw of a mammal is a single bone. E)The lower jaw of a reptile contains 12 teeth.
A physical feature, such as a body of water, might actually aid transportation and migration because ocean travel may be easier than overland travel. However, if that physical feature hinders migration, it is an example of
A) an environmental push factor. B) a forced migration. C) an intervening obstacle. D) a cultural pull factor. E) an environmental incentive.