IGNEOUS ROCKS

By Sophia and Danny

HOW IGNEOUS ROCKS ARE

FORMED

I

gneous rocks are rocks formed by the cooling, hardening, and the freezing of lava

or magma

I

gneous rocks may or may

not crystallize while cooling

M

ost of the 700 igneous rocks

are formed under the Earth’s crust

THE ROCK TYPES AND THEIR DIFFERENCES

I

gneous

S

edimentary

M

etamorphic

T

he difference between igneous and metamorphic is that the metamorphic rocks are formed

under pressure and igneous rocks are just cooled off lava/magma.

T

he difference between igneous and sedimentary rocks are that sedimentary rocks are made

of different rocks, animal parts, and plants mushed together to make one rock.

Intrusive rocks:

Solidified inside the

Earth’s surface

As the active volcano

turns into a extinct volcano,

the lava /magma inside

hardens and becomes a

Intrusive Igneous rock

INTRUSIVE AND EXTRUSIVE

ROCKS

Extrusive rocks:

Solidified above the

Earth’s surface.

First a volcano erupts or

magma/lava oozes out the

volcano. Then the

magma/lava cools or

hardens to form a

extrusive igneous rock

Extrusive rocks:

Basalt

Obsidian

Pumice

Rhyolite

Scoria

TYPES OF INTRUSIVE AND

EXTRUSIVE IGNEOUS ROCKS

Intrusive rocks:

Diorite

Gabbro

Pegmatite

Granite

THE ROCK CYCLEThis is the rock cycle:

WE HOPE YOU WERE LISTENING! THAT’S BECAUSE

THERE IS GOING TO BE A QUIZ!

QUIZ!

W

hat rock is this rock?

I

s a Gabbro an intrusive or an extrusive rock?

W

hat’s the difference between an intrusive and a extrusive rock?

W

ho are the authors of this PowerPoint?

A JOKE

Q=What music does rocks like best?

A=rock & roll!

WORDS YOU MAY NOT KNOW/INDEX

C

rystallize- A form of a rock slowly or quickly turned into a

crystal/rock

l

ava/magma-a liquid that is formed inside a volcano, and when

cooled off it’s turned into a igneous rock

S

ophia-wisdom

D

anny-Clear water of the East Sea

ANY QUESTIONS?

Ask a question

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