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chapter b1 science t
earths crust test on tuesday
Term | Definition |
---|---|
Crust | the thin layer of earth |
magma | the hot molten rock deep inside earth |
magnetic fields | The space around a magnet within which the force of the magnet is exerted the magnet attracted all the iron filiings within its magnetic field |
magnetic reversal | the swiching or changing of earths magnetic pole such that the north magnetic pole position and vice versa scienctist have found evidenve of magnetic reversals in layers of rock along the ocean floor |
Mantle | the middle layer of earth |
Mid ocean ridge | a chain of mountains under the ocean |
Pangea | A super contintent that existed about 200 million years ago |
Plate | one of the slabs that make up earths crust and upper mantle |
plate boundary | a place plate that make up earths crust and upper mantle either move together or apart or else move past one another |
Sea floor speading | the process by which new ocean floor is continually being formed as magma rises to the surface and hardens into rock |
Sonar | Sound navigation and ranging |
Lithosphere | solid rocky layer of earth |
Convection currents | the partaking which the energy is transferred |
asthenosphere | the layer of earth below the lithosphere is not rigid |
colliding plates | plates collide or come together at onvergent boudaries |
separating plates | plates move away from one another at divergent boundaries |
Theory of plate tectonics | earths crust and upper mantle are made up of a series of rigid or nearly rigid plates that are in motion |
sliding plates | plates move past one another at transform fault boundaries |
Folded mountains | these form when two tectonic plates collide |
fault block mountains | large crack in the earth masses of rock move up or down along a fault |
pikes peak | dome mountain |
dome mountains | The surface is lifted up by magma forming a broad dome or bulge.wind and rain erode the dome stripping away layers of sedimentary rock and exposing the igneous rock below |
volcanoes | fourth type of mountains are common along convergent and divegent plate boundaries |
Mountains | pb45,47,48 |
interaction of plates | coming together moving apart sliding past |
Plates | pb40,41 |