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为了帮助大家备考托福阅读，练习更多阅读题目。提高阅读水平，下面小编给大家带来托福阅读辅导:老托福阅读真题及答案 passage13，希望对大家有所帮助!

老托福阅读文本passage13

Any rock that has cooled and solidified from a molten state is an igneous rock. Therefore, if the Earth began as a superheated sphere in space, all the rocks making up its crust may well have been igneous and thus the ancestors of all other rocks. Even today, approximate

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