Sedimentary Rocks. DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary...
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Transcript of Sedimentary Rocks. DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary...
![Page 1: Sedimentary Rocks. DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary rocks form in various regions oceans, lakes, rivers,](https://reader036.fdocuments.in/reader036/viewer/2022081420/56649cbf5503460f949857f9/html5/thumbnails/1.jpg)
Sedimentary RocksSedimentary Rocks
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Sedimentary RocksSedimentary Rocks
DID YOU KNOW?DID YOU KNOW?
75% of rocks exposed at Earths surface are sedimentary
Sedimentary rocks form in various regionsoceans, lakes, rivers, beachesglaciated areasdeserts
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![Page 4: Sedimentary Rocks. DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary rocks form in various regions oceans, lakes, rivers,](https://reader036.fdocuments.in/reader036/viewer/2022081420/56649cbf5503460f949857f9/html5/thumbnails/4.jpg)
Sedimentary Rock
• Sedimentary – Formed in layers as a result of pressure on sediments (small pieces of rock)
• Sediments settle in low places, usually near or under bodies of water.
• No Heat involved in formation
![Page 5: Sedimentary Rocks. DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary rocks form in various regions oceans, lakes, rivers,](https://reader036.fdocuments.in/reader036/viewer/2022081420/56649cbf5503460f949857f9/html5/thumbnails/5.jpg)
Sedimentary Rocks • Over time the sediments form
layers that are compacted together over time and form rocks.
• Sedimentary rocks are almost always found in layers
StrataStratification – the process in which sedimentary rocks are arranged in layers
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Form By Three Main ProcessesForm By Three Main Processes
Compaction- Sediments get compressed andcompacted.
Cementation-Small crystals precipitate and act as glue that holds the rock together.
Precipitation-Crystals precipitate directly from solution.
Sedimentary RocksSedimentary Rocks
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There are 3 Types…
• Clastic – formed from weathering debris
• Chemical – form when dissolved materials precipitate from solution
• Organic – form from the accumulation of plant or animal debris
![Page 8: Sedimentary Rocks. DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary rocks form in various regions oceans, lakes, rivers,](https://reader036.fdocuments.in/reader036/viewer/2022081420/56649cbf5503460f949857f9/html5/thumbnails/8.jpg)
ClasticBreccia
Conglomerate
Contains large angular fragments
Large rounded fragments
Sandstone
Shale
Sand-sized debris, often found around beaches and deserts
Made of clay-sized debris, often breaks into flat pieces
![Page 9: Sedimentary Rocks. DID YOU KNOW? 75% of rocks exposed at Earths surface are sedimentary Sedimentary rocks form in various regions oceans, lakes, rivers,](https://reader036.fdocuments.in/reader036/viewer/2022081420/56649cbf5503460f949857f9/html5/thumbnails/9.jpg)
Chemical
Limestone – forms chemically from precipitation of calcium carbonate from lake or ocean water
Rock salt – forms from the evaporation of ocean or saline lake waters. Rarely found at Earth’s surface
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OrganicCoal – Forms from Plant Debris – Often found in Swamp areas