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Answer:

Across
2an explanation based on many observations during repeated experiments; called only if consistent with observations, can be used to make testable predictions, and is the simplest explanation; can be _____ or modified with the discovery of new data
5a series of problem-solving procedures that help _____ conduct experiments
6blanket of gases surrounding Earth that contains about 78 _____ nitrogen, 21 percent oxygen, and 1 percent other gases such as argon, carbon dioxide, and water vapor
Down
1factor in an experiment that can change if the _____ variable is changed
2standard for comparison in an experiment
3the part of Earth from its surface to its center
4environmental _____
 
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