Fossil Fuels Crossword Puzzle

QUESTIONS LIST: natural gas : a flammable material without a definite form, produced from remains of marine organisms buried under layers of sediments found near oil deposited, oil : a flammable liquid produced from remains of marine organisms buried under layers of sediment for millions of years, organic matter : the waste and remains of plants and animals, fossil fuels : a natural non-renewable fuel such as coal, oil, natural gas, formed over millions of years from the remains of living organisms, sedimentary rock : layers of rock formed when sediment is deposited and then compacted and cemented over time, coal : a solid fossil fuel that is formed from the concentrated remains of plants over very long periods of time, pressure : force of objects pushing on other objects.