During the ”snowball Earth” period about 700m years ago, Earth’s climate shut down. The planet was encased in ice and insulated from seasonal variations: spring, summer, autumn and winter all stopped. Or at least that was the theory.
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（十）放射性废物，是指含有放射性核素或者被放射性核素污染，其浓度或者比活度大于国家确定的清洁解控水平，预期不再使用的废弃物。