| A | B |
|---|
| fossil | the remains of a plant or animal that lived long ago |
| soil | a material made up of tiny pieces of weathered rock |
| sedimentary rock | rock that forms when sediments are pressed together |
| humus | decaying plant and animal material in the soil |
| loam | soil rich in nutrients that is good for plant growth |
| soil texture | the size of soil particles |
| clay | material made of very small grains of minerals |
| oil | a flammable liquid produced from organic matter buried under layers of sediments for millions of years |
| natural gas | a flammable material, without a definite form, produced from organic material buried under layers of sediment found near oil deposits |
| pressure | the action of force by one object against another (in a geyser, hot water escapes the pressure from under layers of Earth's crust) |
| fossil fuel | non-renewable flammable material (coal, oil, natural gas) made from the remains of plants and animals buried in Earth's crust that is used to produce heat and power |
| organic matter | the waste and remains of plants and animals |
