| A | B |
|---|
| Lithosphere | The solid surface and interior of the earth |
| Hydrosphere | The water layer of the earth |
| Atmosphere | The layer of air surrounding the earth |
| Biosphere | The parts of the earth where living things are found |
| Plate tectonics | The study of plates and how they move |
| Continental drift | The theory of how continents move over time |
| Groundwater | Water found underground |
| Chemical reaction | A chemical change |
| Vapor | Water or other materials in the form of a gas |
| Troposphere | The layer of the atmosphere people live and breathe in |
| Stratosphere | The layer of the atmosphere above the troposphere |
| Mesosphere | The layer of the atmosphere between the stratosphere and thermosphere |
| Thermosphere | The layer of the atmosphere above the mesosphere |
| Ozone Layer | The layer of the atmosphere that protects earth from harmful solar radiation |
| Ultraviolet radiation | High-energy radiation from the sun |
