Term
|
Definition
| an astronomical object that is compared of a mass of ice and dust and has a long luminous tail produced by vaporization when its orbit passes close to the sun. |
|
|
Term
|
Definition
| in astronomy, the Earth's yearly trip around the sun, taking 365.5 days. |
|
|
Term
|
Definition
| the weather conditions prevailing in the doldrums that cause sailing ships to become becalmed. |
|
|
Term
|
Definition
| the gradual wearing away of rock or soil by physical breakdown, chemuical solution, and transportation of material, as caused, e.g. by water, wind, or ice. |
|
|
Term
|
Definition
| an imaginary line along the crest of an anticline or the trough of a synical at the point of maximum curvature. |
|
|
Term
|
Definition
| the layer of the upper atmosphere, from 15 to 50km (10 to 30 mi) above the Earth's surface, where most atmospheric ozone collects, absorbing harmful ultraviolet radiation from the Sun. In the 1980's it was realized that industrial pollutants such as CTC's were damaging the ozone layer and that holes had appeared in it, especially over the Antarctic. |
|
|
Term
|
Definition
| molten rock deep within the Earth from which igneous rock is formed by solidification at or near the Earth's surface. |
|
|
Term
|
Definition
| Underlying soil or rock that remains permanently frozen, found mainly in the polar regions. |
|
|
Term
|
Definition
| a large body of continuously accumulating ice and compacted snow, formed in mountain valleys or at the poles, that deforms under its own weight and slowly moves. |
|
|
Term
|
Definition
| the part of Earth or another planet that lies between the crust and core. |
|
|
Term
|
Definition
| an irregularly shaped rock that orbits the Sun, mostly occuring in a band asteriod belt between the orbits of Mars and Jupiter. Asteriods range in size from the largest, Ceres, with a diameter of 930km (580mi), down to dust particles. |
|
|
Term
|
Definition
| to cause a layer of rock to bend, or undergo this process. |
|
|
Term
|
Definition
| toward the direction the wind is blowing from. |
|
|
Term
|
Definition
| relating to nature the process of vegetating. |
|
|
Term
|
Definition
| a fine-grain yellowish brown deposit of soil left by the wind. The loess deposited by winds from Central Asia provided the basis for productive farming in early China. |
|
|
Term
|
Definition
| an increase in the world's temperatures, believed to be caused in part by the greenhouse effect. |
|
|
Term
|
Definition
| the bush, cultivated in temperate regions, that produces currants, especially red currants or black currants. |
|
|
Term
|
Definition
| the bush, cultivated in temperate regions, that produces currants, especially red currants or black currants. |
|
|
Term
|
Definition
| a statement that is assumed to be true for the sake of argument. |
|
|
Term
|
Definition
| water held underground in soil or permeable rock, often feeding springs and wells. |
|
|
