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Our Planet Earth
Part 2-Core Concepts
Term | Definition |
---|---|
Orbit | the path one object makes as it revolves around another |
axis | imaginary line between the North and South Poles |
revolution | elliptical journey around the sun |
solstice | the point in the calendar year of the longest or shortest day |
equinox | the point in the calendar year when the length of the day is the same everywhere on Earth |
rotation | one complete turn on an axis |
time zone | areas on the Earth that share the same time |
core | sphere of very hot metal at the center of the Earth |
mantle | thick, rocky layer the surrounds the core |
crust | thin layer of rocks and minerals that surrounds the mantle |
atmosphere | thick layer of gas and air above the surface of the Earth |
landforms | types of land such as mountains, plateaus, and valleys |
weathering | process that breaks rock into tiny pieces |
erosion | process by which water, ice, and/or wind move small pieces of rock |
deposition | process of eroded material settling |
plains | large flat areas or gently rolling hills |
plateau | mostly flat land that rises above surrounding land |
valley | stretches of low land between mountains or hills |
delta | flat plains that form when a river fans out and deposits material |
plate tectonics | theory that states large land plates inside the Earth move |
plates | large blocks of rock and soil that make up the Earth's crust |
magma | molten or semi-molten rock stored in the Earth's crust |
lava | magma that reaches the surface of the Earth |
faults | seams or cracks in the Earth's crust |
Earth | the sphere you live on |