ROCKS AND LANDFORMS

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ROCKS AND LANDFORMS

• MAJOR ROCK TYPES AND A FEW DESERT LANDFORMS

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START WITH SEDIMENT ERODED FROM EXISTING ROCK
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SOLIDIFY IT BY BURYING AND CEMENTING IT
AND YOU NOW HAVE SEDIMENTARY ROCK
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EXAMPLES OF SEDIMENTARY ROCK
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TAKE EXISTING ROCK
AND YOU NOW HAVE IGNEOUS ROCK
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TAKE EXISTING ROCK
APPLY HEAT PRESSURE
AND YOU NOW HAVE METAMORPHIC ROCK EXAMPLE
METAMORPHOSED GRANITE IS GNEISS
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THE ROCK CYCLE
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LANDFORMS
ALLUVIAL FAN FAN-SHAPED SEDIMENT (ALLUVIUM)
DEPOSITED AT MOUTH OF CANYON
BAJADA BROAD SLOPE OF SEDIMENT COMPOSED OF
COALESCED ALLUVIAL FANS
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MORE LANDFORMS
PLAYA DRY (USUALLY) LAKE BED OFTEN HIGH IN
SALTS LEFT WHEN WATER EVAPORATES
BAJADA
PLAYA
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REVIEW 1
HOW DO YOU TURN SAND INTO SEDIMENTARY ROCK?
SOLIDIFY/CEMENT IT
HOW DO YOU TURN SAND INTO IGNEOUS ROCK?
HOW DO YOU TURN SAND INTO METAMORPHIC ROCK?
MELT AND SOLIDIFY IT
TURN IT INTO ROCK THEN APPLY HEAT AND PRESSURE
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REVIEW 2
PIMA COMMUNITY COLLEGE WEST CAMPUS SITS ATOP A
SLOPE OF SEDIMENT FROM THE TUCSON MOUNTAINS WHAT
IS THIS SLOPE CALLED?

• PLAYA
• BAJADA
• ALLUVIAL FAN
• ARROYO