H OW I G N E O U S RO C K S A R E FORMED Igneous rocks are rocks formed by the cooling, hardening, and thefreezing of lava or magma Igneous rocks may or maynot crystallize while cooling Most of the 700 igneous rocksare formed under the Earth’s crust
THE ROCK TYPES AND THEIR DIFFERENCES Igneous Sedimentary Metamorphic The difference between igneous and metamorphic is that the metamorphic rocks areformed under pressure and igneous rocks are just cooled off lava/magma. The 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.
I N T RU S I V E A N D E X T RU S I V E RO C K S Intrusive rocks: Extrusive rocks: Solidified inside the Solidified above the Earth’s surface Earth’s surface. As the active volcano First a volcano erupts or turns into a extinct magma/lava oozes out volcano, the lava /magma the volcano. Then the inside hardens and magma/lava cools or becomes a Intrusive hardens to form a Igneous rock extrusive igneous rock
T Y P E S O F I N T RU S I V E A N D E X T R U S I V E I G N E O U S RO C K S Extrusive rocks: Intrusive rocks: Basalt Diorite Obsidian Gabbro Pumice Pegmatite Rhyolite Granite Scoria
WE HOPE YOU WERELISTENING! THAT’S BECAUSE THERE IS GOING TO BE A QUIZ!
QUIZ! What rock is this rock? Is a Gabbro an intrusive or an extrusive rock? What’s the difference between an intrusive and a extrusive rock? Who are the authors of this PowerPoint?
A JOKEQ=What music does rocks like best?A=rock & roll!
WORDS YOU MAY NOT KNOW/INDEX Crystallize- A form of a rock slowly or quickly turned into acrystal/rock lava/magma-a liquid that is formed inside a volcano, and whencooled off it’s turned into a igneous rock Sophia-wisdom Danny-Clear water of the East Sea
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