IGNEOUS ROCKS Pg 99 text book . Igneous rock begins as magma What is the origin of Igneous Rock? .
Igneous rock
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Transcript of Igneous rock
Wednesday, April 12, 2023
The Earth’s Crust
Rock FamiliesIgneous Rock
Rock Families
#1 Igneous
There are three rock families:
#2 Sedimentary
#3 Metamorphic
1. Igneous Rock
Igneous Rock - “Born of Fire”
Igneous rock forms from melted rock (lava or magma) when it cools.
Lava – melted rock that is found outside (“on”) the Earth’s crust
Magma – melted rock that is found inside the Earth’s crust
Magma – melted rock that is found inside the Earth’s crust
Lava – melted rock that is foundoutside (“on”) the Earth’s crust
Lava sampling
When lava and magma cool, they form two different kinds of Igneous rock:1. Intrusive rock – igneous rock that is formed from cooled magma (e.g. granite)
2. Extrusive rock – igneous rock that is formed from cooled lava (e.g. pumice)
The main difference between intrusive and extrusive rock is their crystal size, which depends on how quickly they cool.
Intrusive rock (from magma) cools very slowly inside the Earth’s crust
and forms large crystals.
Extrusive rock (from lava) cools quickly and forms small crystals..
Igneous rock video
Examples of Igneous Rock:GranitePumiceObsidianBasalt