Transcript Intrusive and Extrusive Igneous Rocks

Intrusive and
Extrusive Igneous
Rocks
Eric Angat
Environmental Science
1. What are the building blocks of rocks?
2. How are rocks classified?
http://www.youtube.com/watch?v=aCnAF1Opt8M
3. What are the parts of a volcano?
pyroclastic cloud
and ash
Crater
Lava
vent
sill
Magma
conduit
Magma
chamber
4. What are the two types of
igneous rocks?
1. Extrusive
rock
forms on the
surface.
2. Intrusive
rock
forms
underground
or plutons.
5. What are plutons
or intrusive igneous rocks?
A pluton is magma that moves upward
and cuts across pre-existing layers of
rock.
Plutons include
batholiths,
dikes,
sills,
and Laccoliths.
6. Describe the different shapes of plutons
or intrusive igneous rocks.
Lacolliths
dome shaped
Sill
flat shape
Dike
tabular
shape
Batholiths-
large irregular shaped
7. Describe basalt rock.
Basalt rock- Igneous
is an extrusive rock.
Is formed from
rapidly cooled lava.
It is fine grained
which means it has
very small crystals.
8. Describe obsidian rock.
is an extrusive rock.
Obsidian rock- Igneous
Lava comes in
contact with water
resulting to rapid
cooling.
glassy texture in the
resulting rock.
Iron and magnesium give the obsidian a
dark green to black color.
9. Describe vesicular
igneous rock.
Pumice Vesicular rockIgneous
Pumice is a highly
vesicular pyroclastic
igneous rock
Pumice - formed from
quickly cooled lava.
Usually lava ejected
into the air by volcanic
eruption.
10. Describe granite rock.
Granite rock- Igneous
is an intrusive rock.
Intrusions (plutons) are
bodies of igneous rock that
result from crystallization of
magma deep underground.
Slow cooling at depth in
the Earth produces
larger crystals.
11. Why do intrusive rocks
have bigger crystals than
extrusive rocks?
Basalt rock- extrusive
Igneous
Granite rock- intrusive
igneous
Crystals are
more evident in
intrusive rocks!
Crystals are bigger in intrusive rocks because magma cools
slowly. This gives time for the crystals to grow larger.
12. Which of the following could
increase the rate of chemical
weathering of a rock?
a. moving it to a location with few
plants and animals
b. moving it to a drier climate
c. increasing its total surface
area
d. moving it to a colder climate