This was created to meet the curriculum outcomes in New Brunswick's Grade 7 Science Earth's Crust Unit.

1. Friday, January 30, 2015
The Earth’s Crust
Rock Families
Igneous Rock

2. Rock Families
#1 Igneous
There are three rock families:
#2 Sedimentary
#3 Metamorphic

3. 1. Igneous Rock
Igneous Rock -
“Born of Fire”
Igneous rock
forms from
melted rock
(lava or magma)
when it cools.

4. Lava – melted rock that is found
outside (“on”) the Earth’s crust

5. Magma – melted rock that is
found inside the Earth’s crust

6. Magma – melted rock that is
found inside the Earth’s crust
Lava – melted rock that is found
outside (“on”) the Earth’s crust
Lava sampling

7. 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)

8. 2. Extrusive rock
– igneous rock
that is formed
from cooled lava
(e.g. pumice)

9. The main
difference
between intrusive
and extrusive
rock is their
crystal size,
which depends on
how quickly they
cool.

10. 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

11. Examples of
Igneous Rock:
Granite
Pumice
Obsidian
Basalt