rocks Flashcards

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1
Q

what is the crust?

A

the crust is the thin and rocky layer we stand on

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2
Q

what is the mantle?

A

the layer underneath the mantle which is as hard as a rock but slowly flows

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3
Q

what is the outer core?

A

the outer core is the layer of mainly molten iron and nickel which surrounds the inner core

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4
Q

what is the inner core?

A

the inner core is a solid imperfect sphere of solid iron and nickel which gives earth it’s magnetic field

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5
Q

what are igneous rocks?

A

igneous rocks are rocks formed by cooled lava etc obsidian

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6
Q

what are sedimentary rocks?

A

sedimentary rocks are rocks formed by water putting pressure on small rocks and attaches them together this is called cementation etc limestone

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7
Q

what are metamorphic rocks?

A

metamorphic rocks are rocks formed from high pressure or heat not melting the rocks but changing the mineral form etc marble

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