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Sedimentary Rocks
Ch. 4, section 3
Objectives
• Describe the origin of sedimentary rock.
• Describe the three main categories of
sedimentary rock.
• Describe three types of sedimentary rocks.
VOCAB
• Weathering: Process of the breaking down of
rock by the agents of wind, water, ice and
gravity.
• Erosion: Process where Weathered rock is
carried away by wind, water or ice or gravity.
• Deposition: Process when sediments settle out
of the wind, water, or ice that carries it.
VOCAB
• Compaction: Process of pressing together
of sediments under their own weight
• Cementation: Process where dissolved
minerals crystallize and glue particles of
sediment together.
Texting, Anyone?!
Text language for Sedimentary:
WEDCC
WEDCC
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•
•
•
•
W-breaks rocks into sediment
E-moves sediment
D-Drops sediment
C-presses sediment together
C-glues sediment together
3 groups of sedimentary rock
• Organic rock: forms from the remains of once
living plants and animals. Examples: Coral,
Coal
• Clastic: forms when rock fragments are
pressed. Examples: Conglomerate, Sandstone
• Chemical: forms solution of dissolved minerals
and water (chemical process). Example: Halite
Notes
• Weathering agents break the rock down
into sediment.
• Then they carry (erode) these fragments
away and deposit them.
• As layers pile on top, the bottom layers get
compacted together.
• Dissolved minerals can act as glue to
cement these layers into a rock.
Notes, Cont’d
• Sedimentary is classified by the way it
forms. Either organic, chemical, or clastic.