Which of the following elements has two valence electrons?

A. Ne
B. Mg
C. H
D. Li
E. Na


Answer: B

Environmental & Atmospheric Sciences

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a. tiny bubbles of ancient air found in ice cores b. tree rings c. radioisotopes in rocks and fossils d. layers of soot trapped in ice cores e. all of these answers

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The gravel bed load of a stream moves by ________.

A. solution B. flotation C. sliding and rolling D. dissolution E. suspension

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________ is the turbulent water created by breaking waves

A) A swell B) A refracted wave C) A tombolo D) Surf

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Which of the following is the largest region of the Earth's interior?

A) crust B) mantle C) outer core D) inner core

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