A(n) ____________ is a ring-shaped island built of calcium carbonate enclosing, or almost enclosing, a shallow

lagoon from which no land protrudes. Fill in the blank(s) with the appropriate word(s).


atoll

Environmental & Atmospheric Sciences

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Earth’s ocean stores large amounts of carbon dioxide during the cold periods of an Ice Age

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Cytokines perform which of the following functions?

A) bringing leukocytes to injured tissue B) helping leukocytes migrate out of the blood vessels C) activate leukocytes D) all of the above

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Most of Canada lies within which climatic type?

A) B B) C C) D D) E

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For most people living in developed countries, their greatest exposure to radiation is from

A) the natural environment. B) dental X-rays. C) X-rays of the bones of the body. D) exposure to any sort of fossil fuels.

Environmental & Atmospheric Sciences