6.3 structure of earth Flashcards

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1
Q

define crust

A

outer layer of earth

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2
Q

define mantle

A

layer between the core and crust [mostly solid]

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3
Q

define core

A

the innermost part of earth [liquid outer core + solid inner core]

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4
Q

define molten

A

melted or liquified by heat

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5
Q

continental drift meaning

A

the theory that earth continents have slowly changed position

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6
Q

tectonic plates meaning

A

pieces of earth crust and upper mantle that are about 100km thick

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7
Q

magma meaning

A

hot molten or semi-solid material in and below earths crust

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8
Q

what are the parts of earth?

A

crust, mantle, inner core, outer core

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9
Q

what are the parts of earth made of?

A

crust [solid rock], mantle [molten rock], outer core [molten metals, mostly iron and nickel], inner core [solid metals, mostly iron and nickel]

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10
Q

which element in the earths crust is the most and second most?

A

oxygen, silicon

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11
Q

evidence for continental drift

A

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

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12
Q

which are the 7 major plates?

A

african, antarctic, north-american, south-american, i do-australian, eurasian, pacific

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13
Q

plate tectonics theory

A

earths crust is divided into large slabs of solid rock called plates which glide over earths mantle

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14
Q

the plates only move about ____cm each year

A

4

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15
Q

what are plates under the ocean called?

A

oceanic plates

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