They speed up when they get hotter and they slow down when they get colder. I think
Your answer would be an Element can't be separated into simpler substances or converted into another substance by chemical process.
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Answer:
Land resources such as gravel and bedrock are used to construct buildings, roads, and sidewalks. Land is also where city structures—such as buildings, roads, and sidewalks—are constructed. People use land resources such as bedrock and aggregate to construct buildings, roads, and sidewalks.
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