| A | B |
|---|
| fossil fuels | formed over millions of years from plant and animal remains |
| micoroorganisms | microscopic organisms, microbes |
| organic | derived from living organisms containing the element carbon |
| sedimentary rock | composed of materials that were transported by wind or water |
| hydrocarbons | organic compounds of hydrogen and carbon |
| sound waves | vibration of air or other medium causing a sensation in the ear |
| sonogram | image produced by ultrasound waves; used for diagnostic purposes |
| seismic waves | sound waves relating to earth vibration |
