Vocabulary #7

crust: earth solid, rocky surface containing the continents and ocean floor.

original horizontaltalily: the idea that many kinds of rocks form in flat, horizontal layers.

continental drift: the idea that a supercontinent split apart int to pieces, the continets ,which drifted in time to their present location.

sea-floor spreading: the idea the new crust is forming at ridges in the sea floor ,spreding apart the crust on their side of the  ridges

magma.hot,molten rockbelow earth surface.

plate tectonics: the idea that earth surface in brocken into plates that moves

mantle :earth layer beneathth crust

subduction :where plate collide , the sliding of denser ocean plate under another plate.