Weekly Vocabualry Words - 3/14/11

1. avalanche The rapid, downslope movement of snow, similar to a landslide, that occurs on steep slope.
2. caldera A large, bowl-shaped depression formed when the top of a volcano collapses into the emptied magma chamber.
3. bedrock The solid, or continuous, rock that extends into Earth’s interior.
4. dew Liquid water that forms by condensation on cold surface.
5. equinox One of the two days on which the sun rises due east and sets due west, on which the length of day and night are equal, on which the sun’s vertical rays are at the equator; the first day of spring or fall.