earthscience
Terms
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- plate
- large section of earth's oceanic or continental crust that moves on the asthenosphere
- hot spot
- large rising body of magma that can force its way through earth's mantle and curst, can form volcanoes
- crust
- thin outer most layer of the earth
- outer core
- a layer of molten iron and nickel that surrounds the inner core of the Earth
- plate techtonics
- theory that earth's crust and upper mantle are broken into plates that float and move around on a plastic like layer on the mantle
- mantle
- layer of earth lying just below the crust and above the inner core
- convergent boundary
- tectonic plates are moving together
- volcanic eruptions
- vent where magma and gas erupt to the earth's surface
- mid atlantic ridge
- undersea mountain range that forms where 2 plates are pushing apart. diverging plates where magma builds mountains
- pangaea
- large ancient landmass that was composed of all the continents joined together
- convection current
- current in earth's mantle that transfers heat from the interior and is driving plate tectonics
- asthosphere
- the plastic like layer of Earth on which the lithosperic plates float and move
- tectonic plates
- earth's surface is made up of moving plates driven by motions in the mantle and asthenosphere
- plate boundaries
- where edges of the plates meet
- continental drift
- The theory that states that the continents are floating and moving very slowly. Over millions of years, seven separate continents formed from Pangea.
- uplift
- the lifting of land by forces within the earth's crust
- sea floor spreading
- ,Process that forms a new sea floor when magma pushes upward at mid-ocean ridge
- collide
- to come together
- inner core
- At the very center of Earth is a solid, very dense _______ composed mostly of iron and nickel.
- divergent boundary
- tectonic plates moving away from each other
- ring of fire
- string of volcanoes around the rim of the pacific ocean resulting from plate boundary activity
- lithosphere
- outermost, rigid layer of the Earth and upper mantle
- plasticity
- having properties similar to a liquid to flow
- subduction
- ,Areas in which oceanic crust is forced back down into ocean trenches
- earthquakes
- caused by sudden shift along a fault line, energy travels in waves through the earth causing shaking