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Social Studies (7th gr.)Our world Today Chap.2

Terms

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Geograpy
Study of the earth in all its variety land, water , plants, and animals
Landform
individual feature of the land, such as a mountain or valley
Region
area that shares common characterisitcs
Global Positioning system
Group of satalites that travels around the earth; which can be used to pin point an exact location
Geographic Information Systems
Special software that helps geographers gather and use different kinds of information about a place
Plate Tectonics
theory that the earth's crust is not an unbroken shell but consists of plates or huge slabs of rock that move
Fault
crack in the earth's crust
Plain
low-lying stretch of flat or gently rolling land
environment
natural surroundings
plateau
flat land with higher elevation than a plain
canyon
deep narrow valley with steep sides which a river has cut through a plateau
aquifer
underground rock layer that stores large amounts of water
climate
usual predictabel patter of weather in an area over a long period of time
tropics
low-latitudes region between the tropic of cancer and the tropic of capricorn
greehouse effect
buildup of certain gasses in the atmosphere that like a greenhouse prevent the warm air from escaping into the atmoshere, resulting in increase of the earths temperature
conservation
careful use of resourses so they are not wasted
pesticide
powerful chemical that kills crop destroying insects
ecosystem
place where the plants and animals are dependent upon one another and their surroundings for survival
crop rotation
varing what is planted in a field to avoid using up all the minerals in the soil
erosion
process of moving water and wind across the earth's surface, leaving land less furtile than before
deforestation
widespread cutting of forests
acid rain
rain containing high amounts of chemical pollutants

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