Answer: The mesosphere starts at 31 miles (50 km) and extends to 53 miles (85 km) high. The top of the mesosphere, called the mesopause, is the coldest part of Earth's atmosphere, with temperatures averaging about minus 130 degrees F (minus 90 C). This layer is hard to study
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Answer:
Each station that measures the water quality characteristics....
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like temperature and water level maybe....
Atoms. Every element is made of a specific type of atoms.
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Around 4.1 billion years ago, the first single celled life form appeared on Earth
