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Geography Key Terms

#2 Our Planet

orbit path one object makes as it circles around another
revolution circular journey around the sun
axis imaginary line running through Earth between the North and South Poles
equinox point at which, everywhere on Earth, days and nights are nearly equal in length
solstice point at which days are longest in one hemisphere and shortest in another
rotation complete turn
time zones areas sharing the same time
core sphere of very hot metal at the center of the Earth
mantle thick, rocky layer around Earth's core
crust thin layer of rocks and minerals that surrounds Earth's mantle
atmosphere thick layer of gases or air
landforms shapes and types of land
weathering process that breaks rocks down into tiny pieces
erosion process in which water, ice, or wind remove rock and soil
deposition process of depositing material eroded and carried by water, ice or wind
plains large area of flat or gently rolling land
plateau large, mostly flat area that rises above the surrounding land
valley stretch of low land between mountains or hills
delta a flat plain formed on the seabed where a river deposits material over many years
plate tectonics theory that explains how huge blocks of Earth's crust called "plates" move
plate block of rock and soil that makes up Earth's crust
magma stream of soft, nearly molten rock
faults seam in Earth's crust
Created by: westfahl