这是定语从句
先行词是heat,之后有两个定语从句,分别是there is in coal 和that could be extracted from it
至于第一个定语从句为什么没有关系词,是因为：我们可以把先行词代入从句,那么结果是：there is （heat） in coal【在煤矿中有能量】,所以heat代入从句后是充当表语.
这是定语从句的一条规则：如果先行词代入从句充当表语或宾语,关系词就可省略
所以原本是 that there is in coal,然后把that省略了
一头雾水,Just consider that we use hardly one hundred-thousandth
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