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| atlas | a collection of maps, named after the Mythical Greek titan who held the Earth on his shoulders. |
| isotherm | A line drawn on a map linking all points that have the same average temperature for a given period. |
| cyrosphere | The regions of the globe, both land and sea, that are permanently or seasonally covered by snow and ice. |
| precipitation | Water droplets falling from atmospheric water vapor, in the form of rain, sleet, snow, or hail. |
| solar day | The period between two successive passages of the sun through its highest point. |
| temperature | The degree of hotness or coldness of the environment. |
| albedo | The percentage of solar energy reflected back by a surface. In Latin, albedo means "whiteness." White reflects! |
| atmosphere | The mass of gases that surrounds Earth and is held by Earth's gravitational field. |
| climate | General weather conditions expected in a given ares, usually based on the 30-year average weather. Mayu also be applied to large-scale weather patterns (e.g. and ice age climate, a tropical climate). |
| convection | The transfer of heat by the movement of a substance from one position to another.Convection can be forced(as in the heating systems of many houses) or natural (as in the transter of heat in fluids-air, water and molten rock-due to density differences). |
| greenhouse gases | Gases found in Earth's atmosphere, generally in small (or "trace") amounts, that absorb and retain heat. Important greenhouse gases include water vapor, carbon dioxide (CO2),methane (CH4), chlorofluorocarbons (CFCs), and nitrous oxide (N2O). |
| weather | Current atmospheric conditions such as temperature, rainfall, wind, and humidity. |
