| Term | Definition |
| conduction | transfer of energy by direct contact of particles |
| hydrosphere | composed of all the water on Earth |
| convection | transfer of energy by large masses of air or water (circular movement) |
| gravity | force of attraction; causes air to be denser near surface |
| radiation | transfer of energy that does not require matter |
| condensation | process that changes water vapor in a liquid during cooling |
| greehouse effect | CO2 in atmosphere traps reflected heat; keeps Earth warm |
| freshwater | most on Earth is found in glaciers and ice caps |
| plate tectonics | theory that Earth's crust is made of plates that move over the mantle; creates mountains |
| weather | large scale atmospheric phenomenon |
| erosion | removal and transport of surface material by water and wind |
| inner core | hottest part of Earth; 4000-5000 degrees Celcius |
| water cycle | continuous movement of water into air, on to land, and back to lakes and rivers |
| Richter scale | used to measure energy (magnitude) of earthquakes |
| ozone | layer of O3 in stratosphere that protects us from UV radiation |
| magma | molten rock found in upper mantle |
| volcano | can erupt and release enough gas & dust to block sunlight |
| oxygen | 2nd most abundant gas in atmosphere (behind nitrogen) |
| salinity | measure of the amount of salt in water |
| evaporation | process where liquid water is change to gas by a rise in temperature |
| ocean surface | currents here are driven by wind |
| open system | Earth's energy |
| closed system | Earth's matter |
| crust | Earth's thin outer layer made up of oceanic and continental |
| seismic waves | speed and direction of these tell scientists about our interior |
| hemisphere | half of Earth; circulation of wind or water depends on this location |
| biosphere | all areas of Earth where organisms exists |