CHAPTER 4 - ROCKS
4-2 IGNEOUS ROCKS
IGNEOUS ROCKS – HOW THEY FORM
IGNEOUS ROCKS – HOW IT FORMS

Intrusive Rocks
 Below
earth’s surface – cools slow
 Large grains

Extrusive Rocks
 On
earth’s surface – cools fast
 Small or no visible grains
REVIEW: TYPES OF MAGMA

Basaltic

Granitic
CLASSIFICATION OF IGNEOUS ROCKS

Basaltic Rocks
 Heavy,

Dense, Dark
Granitic Rocks
 Light
colored, lower density (trapped gasses)
MOVIE: IGNEOUS ROCK 12:00

During the movie, write down 6 things you
learned about igneous rocks.
CLASSIFY `EM

Intrusive vs. extrusive & basaltic vs. granitic
MORE Q’S
1.
2.
3.
Why do some types of magma and lava form
igneous rocks that are dark and dense?
How do intrusive and extrusive rocks differ?
Where would you expect to find a granitic rock,
near a slow flowing volcano in Hawaii, or near
Mount Saint Helens, Washington?
4-3 METAMORPHIC ROCKS
METAMORPHIC ROCKS – HOW THEY FORM
METAMORPHIC ROCKS – HOW THEY FORM
CHARACTERISTICS

Folliated
 Banded,
layers.. Can be
separated along layers(slate,
gneiss)

Non-foliated
 No
easily visible bands
(marble)
MOVIE: METAMORPHIC ROCKS (20:00)

Like last time, write 6 things you learned along
the way.
MORE QUESTIONS 
1.
2.
3.
4.
How is igneous rock different from
metamorphic rock?
How are metamorphic rocks characterized?
Where might you find igneous rock?
Where might you find metamorphic rock?
4-4 SEDIMENTARY ROCKS
SEDIMENTARY ROCKS – HOW THEY FORM
SEDIMENTARY ROCKS – HOW THEY FORM

Sediments compact and cement together.
 What

does compact and cement mean?
Where do sediments come from?
 Weathering
and erosion.
 Clay, Silt, Sand, Gravel
3 TYPES OF SEDIMENTARY ROCKS…
1.
2.
3.
Detrial
Chemical
Organic
DETRIAL SEDIMENTARY ROCKS

Made from broken fragments from other rocks.
CHEMICAL SEDIMENTARY ROCK

Forms when minerals dissolve out of solution
Rock salt
ORGANIC SEDIMENTARY ROCK

Rocks form from once-living things
Coal
DIDJA GET IT?
1.
2.
3.
How do sedimentary rocks form?
Where do the sediments come from?
Create a story where a rock is born from
magma, goes through two other rock forms,
and eventually reforms as magma.