Transcript Warm-Up

Sedimentary Rock
Classification and Formation
Weathering
• the breakdown of rocks into smaller pieces
(sediments) over time due to heat, wind,
water, ice, pressure and gravity
•http://www.geography.ndo.co.uk/animationsweathering.htm#
http://www.uky.edu/AS/Geology/howell/goodies/elearning/module07swf.swf
Erosion
 the movement of sediments caused by
wind, water, ice and gravity
http://serc.carleton.edu/NAGTWorkshops/visualization/collections/soil_erosion.html
Sediment
 The minerals, sand,
shells, small rocks
and organic matter
that make up
sedimentary rocks.
Compaction
• Occurs when pressure brings sediments
together.
http://www.uky.edu/AS/Geology/howell/goodies/elearning/module05swf.swf
Cementation
• Occurs when minerals act as glue to stick
sediments together
• This happens when water washes over
sediments, leaving dissolved minerals
behind
http://www.classzone.com/books/earth_science/terc/content/visualizatio
ns/es0605/es0605page01.cfm?chapter_no=visualization
Precipitation
• Occurs when minerals solidify because of
water evaporation
http://www.windows.ucar.edu/tour/link=/earth/geology/sed_chemical.html
Clastic Rocks
• from compaction and
cementation of
sediments (sand,
shells, minerals, and
small rocks)
Chemical Rocks
 Form when minerals
solidify into rock after
the water they were
dissolved in
evaporates
(precipitation)
Organic Rocks
 from compaction and
cementation of
organic materials
and/or sediments
(sand, shells,
minerals, and small
rocks)
 These are the only
rocks that contain
organic material
Features of Sedimentary Rocks
• Stratification: arranged in visible layers.
• Fossils: remains, impressions, or
evidence of plant/animal existence
preserved in rock.
• Ripple Marks: fixed sand patterns formed
by wind, stream, waves, currents.
• Mud Cracks: muddy water dries out.
Pics
Stratification
Fossils
Pics
Ripple Marks
Mud Cracks