Download Do Now - TeacherWeb

Igneous Rocks
Earth Science
Week 4 part 1
Mrs. Rubright
What is the difference between magma and lava?
Magma vs. Lava
Magma is molten rock beneath the Earth’s surface.
When magma reaches the Earth’s surface, it is called lava.
What do you think of when you hear “lava”?
What happens when it cools?
Rock – A hard substance made up of one or more minerals
Igneous Rocks
Igneous rocks form when lava or magma cools and
crystallizes.
There are 2 types of
igneous rocks:
Extrusive
Intrusive
Extrusive Igneous Rocks
• Form when lava cools
on Earth’s surface
• Cool quickly
• Fine-grained
• Sometimes have holes
from escaping gas
Extrusive Igneous Rocks
Intrusive Igneous Rocks
• Form when magma cools
inside of Earth’s crust
(INtrusive rocks form INside
the volcano!)
• Cool slowly
• Large-grained (can see
crystals)
Intrusive Igneous Rocks
Is this rock extrusive or intrusive?
It’s intrusive!
What evidence tells you that this rock is intrusive?
Did this rock form inside or outside of
a volcano?
Inside the volcano!
Remember that INtrusive rocks form INside volcanos, where
magma cools slowly and forms crystals.
Is this rock extrusive or intrusive?
It’s extrusive!
What evidence tells you that this rock is extrusive?
Did this rock form inside or outside of
a volcano?
It formed outside of a volcano!
It cooled quickly, so it is fine-grained.
Questions?
• What is an igneous rock?
• What is the difference between an intrusive igneous rock and an
extrusive igneous rock?
• Compare the formation of a large grained igneous rock with that of a
fine grained igneous rock.
Credits
This item is a paid digital download from my TpT store Lindsay’s Lesson Lab . As such, it is for use in one
classroom only.
Fonts: Courtney Keimer
Clip Art:
Rock Photos: Z is for Zebra