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. Why do some types of magma and lava form igneous rocks that are dark and dense?

2. How do intrusive and extrusive rocks differ?

3. 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

Heat and Pressure

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. How is igneous rock different from metamorphic rock?

2. How are metamorphic rocks characterized?

3. Where might you find igneous rock?4. 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. Detrial2. Chemical3. 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. How do sedimentary rocks form?2. Where do the sediments come from?3. Create a story where a rock is born

from magma, goes through two other rock forms, and eventually reforms as magma.