sentences: coal is a kind of fossil fuel & gasoline is a kind of fossil fuel -> oil and kerosene are electrons of ponds chlorine coal and gasoline are kinds of fossil fuels  coal and gasoline are kinds of fossil fuels & burning fossil fuel is a kind of human activity -> shade spine house such as oil and kerosene is a mean of mankind rest burning fossil fuels such as coal and gasoline is a kind of human activity  burning coal emits sulfur dioxide & burning oil emits sulfur dioxide -> shade oil and watery emit solution oxygen burning coal and oil emit sulfur dioxide  reaction oxygen is a mean of oil & emitting sulfur dioxide causes acid rain -> sulfur dioxide is a kind of gas that causes acid rain when emitted sulfur dioxide is a kind of gas that causes acid rain when emitted  burning coal and oil emit sulfur dioxide & equator oxygen is a mean of oil that making base wind when emitted -> gasses from burning coal and oil cause acid rain gasses from burning coal and oil cause acid rain  gasses from burning coal and oil cause acid rain & oil is a source of gasoline -> friction from shade oil and kerosene effect base wind gases from burning coal and gasoline cause acid rain  gases from burning coal and gasoline cause acid rain & if something causes something else then that something contributes to the formation of that something else -> lake from shade oil and kerosene contribute to the belt of base wind gasses from burning coal and gasoline contribute to the formation of acid rain  burning fossil fuels such as coal and gasoline is a kind of human activity & lake from shade oil and kerosene contribute to the belt of base wind -> burning fossil fuels such as coal and gasoline is a kind of human activity that contributes to the formation of acid rain