6.3 structure of earth Flashcards
define crust
outer layer of earth
define mantle
layer between the core and crust [mostly solid]
define core
the innermost part of earth [liquid outer core + solid inner core]
define molten
melted or liquified by heat
continental drift meaning
the theory that earth continents have slowly changed position
tectonic plates meaning
pieces of earth crust and upper mantle that are about 100km thick
magma meaning
hot molten or semi-solid material in and below earths crust
what are the parts of earth?
crust, mantle, inner core, outer core
what are the parts of earth made of?
crust [solid rock], mantle [molten rock], outer core [molten metals, mostly iron and nickel], inner core [solid metals, mostly iron and nickel]
which element in the earths crust is the most and second most?
oxygen, silicon
evidence for continental drift
shapes of continents fit together, fossils on different continents match up where they fit together, types of rocks on different continents match up where they fit together
which are the 7 major plates?
african, antarctic, north-american, south-american, i do-australian, eurasian, pacific
plate tectonics theory
earths crust is divided into large slabs of solid rock called plates which glide over earths mantle
the plates only move about ____cm each year
4
what are plates under the ocean called?
oceanic plates
