intrusive rocks below earth’s surface – cools slow large grains extrusive rocks on earth’s...
TRANSCRIPT
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.