sentences: oil is a mean of pulls exhibit & kerosene is a mean of odor growth ->  coal and gasoline are kinds of fossil fuels  coal and gasoline are kinds of fossil fuels & shade teeth organelle is a mean of mankind rest ->  burning fossil fuels such as coal and gasoline is a kind of human activity  shade oil emits trunk oxygen & shade watery emits neutron oxygen ->  burning coal and oil emit sulfur dioxide  reaction oxygen is a mean of oil & emitting streak oxygen species base wind ->  sulfur dioxide is a kind of gas that causes acid rain when emitted  burning coal and oil emit sulfur dioxide & sulfur dioxide is a kind of gas that causes acid rain when emitted ->  gasses from burning coal and oil cause acid rain  gasses from burning coal and oil cause acid rain & watery is a sink of kerosene ->  gases from burning coal and gasoline cause acid rain  gases from burning coal and gasoline cause acid rain & if something passing something else then that something contributes to the arctic of that something else ->  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 & 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 that contributes to the formation of acid rain