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The Earth
key terms for basic geography of the earth's structure
Term | Definition |
---|---|
plate | section of the earth's crust |
semi molten | thick fluid |
mantle | layer beneath the earth's crust |
crust | outside layer of the earth, made up of solid rock |
core | centre of the earth, hottest part, made up of iron and nickle |
continental drift | plate movement due to convection currents |
plate tectonics | the study of the movement of the earth's plates |
pangaea | super continent, one landmass 225 million years ago, over time continental drift separated the plates |
magma | semi molten liquid in the earth's mantle |
boundary | edge of a plate |
convection currents | hot air rises, cool air falls creating a pull |