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Science 6.1-6.2

QuestionAnswer
inner core very center of the earth; ball of hot solid metals
outer core layer of liquid metals that surrounds the inner core
mantle earths thickest layer that surrounds the outer core
crust outer most layer of the earth
continental crust continents and major islands
oceanic crust all the ocean floors
lithosphere Earth's crust and the very top of the mantle
asthenosphere lithosphere sits on top of it; a layer of hotter, softer rock in the upper mantle
tectonic plates many large and small slabs of rock that fit together like a jigsaw puzzle making up Earth's surface
continental drift the hypothesis that Earth's continents move on the Earth's surface - Alfred Wegener
pangaea the supercontinent - all continents joined together means "All Lands" in Greek
the Theory of Plate Tectonics a therory stating that the Earth's lithosphere is broken into large moving pieces which carry both continental and oceanic crust
mid-ocean ridges huge underwater mountain ridges
sea-floor spreading molten rock rises through cracks in the ocean's crust; cools to form new oceanic crust' old crust is pulled away to make room for new material (recycling)
trenches deep canyons
convection energy transfer by the movement of a material; hot soft rock heats up becomes less dense and rises; at the surface the rock cools, becomes more dense, and sinks
convection current motion that transfers heat energy in the material
slab pull occurs where gravity pulls the edge of a cool dense plate into the asthenoshpere
ridge push occurs when material from a mid-ocean ridge slides downhill from the ridge
Created by: vharris25
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