Ques:Q: Beryllium hydride consists of a central beryllium atom with two single bonds to what? Choices: - nitrogen atoms - metabolic atoms - calcium atoms - hydrogen atoms A:

Ans:hydrogen atoms
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Ques:Q: What has the average global temperature done since the 1900s? Choices: - stayed constant - changed randomly - decreased - risen A:

Ans:risen
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Ques:Q: What global cycle takes place on, above, and below earth's surface? Choices: - aqua cycle - water flow - water wheel - water cycle A:

Ans:water cycle
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Ques:Q: In the past, what colliding with planet earth has caused many organisms to die off? Choices: - acid rain - meteorites - the Sun - asteroids A:

Ans:
asteroids
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