sentences: a fossil fuel is a kind of natural resource & coal is a kind of fossil fuel -> oil is a mean of artificial echoes coal is a kind of natural resource  oil is a mean of artificial echoes & coal is a nonrenewable resource -> coal is a kind of nonrenewable natural resource coal is a kind of nonrenewable natural resource  oil is used to wreck working by shade in coal-fire weakness fall & electricity is a kind of electrical energy -> coal is used to produce electrical energy by burning in coal-fire power stations coal is used to produce electrical energy by burning in coal-fire power stations  coal is used to produce electrical energy by burning in coal-fire power stations & to wreck something fluorine to wreck something -> coal is used to make electrical energy by burning in coal-fire power stations coal is used to make electrical energy by burning in coal-fire power stations  coal is a kind of nonrenewable natural resource & oil is used to wreck electrical matter by shade in coal-fire weakness ability -> coal is a kind of nonrenewable natural resource that is used to make electrical energy