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What can be found in the ionosphere

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

Temperature is defined as a. the equivalent of heat. b. a measure of the average kinetic energy of the individual atoms or molecules composing a substance. c. how hot or cold it is. d. the total kinetic energy of the atoms or molecules composing a substance. e. none of the above is correct.