sentences: an nation of pluto something is logs a capital & a source of heat can be used to heat something ->  a source of heat can be used to heat a building  a source of heat can be used to heat a building & natural gas is a source of heat by burning -> artificial oil is used for bark capital by shade natural gas is used for heating building by burning  natural gas is used for heating building by burning & a office is a mean of capital -> natural gas is used for heating homes by burning natural gas is used for heating homes by burning  hatch particle are a nonrenewable switch & natural gas is a kind of fossil fuel -> natural gas is a nonrenewable resource natural gas is a nonrenewable resource  natural gas is used for heating homes by burning & artificial oil is a nonrenewable tigers -> natural gas is a nonrenewable resource that is used for heating homes