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vocabulary
geology
34
Other
7th Grade
09/30/2009

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Term
magma
Definition
molten rock
Term
continent
Definition
one of seven large landmasses on earths suface
Term
tectonic plates
Definition
a large rigid section of the earths crust that is in constant motion
Term
earthquake
Definition
a sudden movement of the earths crust followed by a series of shocks
Term
Ring of Fire
Definition
a zone of volcanoes around the pacific ocean
Term
volcano
Definition
an opening in the earths crust from which molten rock,ash, and hot gases flow or are thrown out
Term
weathering
Definition
the gradual physical and chemical breakdown of rocks on the earths surface
Term
erosion
Definition
the wearing away and movemean of weathered materials by water, wind, and ice
Term
sediment
Definition
peices of rock in the form of sand,water, or ice
Term
glacier
Definition
a large, slow moving mass of ice
Term
drainage basin
Definition
the area drained by a major river
Term
ground water
Definition
water found beneath the earths surface
Term
hydrologic cycle
Definition
the circulation of water between the earths, the oceans, and the atmoshere
Term
landforms
Definition
a feature on the earths surfaceformed by physical forces
Term
plateau
Definition
a broad, flat area of land higher then the surrounding land
Term
relief
Definition
the difference in the elevation of a landform from its lowest point to its highest point.
Term
continental shelf
Definition
the submerged land at thge edge of a continent
Term
atmosphere
Definition
the layer of gas that surrounds the earth
Term
solstice
Definition
the time during the year when the sun reaches the farthest northern or southern part in the sky
Term
equinox
Definition
one of the two times of the year when the sun's rays are over the equator and the days and night arount the world are an equal lenth
Term
weather
Definition
the condition of the earths atmosphere at a given time or place
Term
climate
Definition
the typical weather conditions of a region over a long period of time
Term
precipitation
Definition
falling water droplets in the form of rain, snow, or sleet
Term
vegetation
Definition
an area that has similar plants
Term
savanna
Definition
a vegetation region with a mix of grassland and scattered trees
Term
desert
Definition
a region with plants specially adapted to dry conditions
Term
global warming
Definition
an increase in the average temperature of the earths atmosphere
Term
greenhouse effect
Definition
the trapping of the sun's heat by gases in the earths atmosphere
Term
greenhouse gases
Definition
any gases in the atmosphere that contributes to the greenhouse effect
Term
fossil fuels
Definition
fuels such as coal,oil, and natural gases
Term
desertification
Definition
the process in which farmland becomes less productive because the land is degraded
Term
sustainable
Definition
using natural resources in a way that they exist for future generations
Term
carbon dioxide
Definition
a gas composed of carbon and oxygen
Term
emissions
Definition
substances discharged into the air
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