10 december 2012 objective: describe the origin of sedimentary rock. intro week ws #16: have you...
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10 December 2012
OBJECTIVE: Describe the origin of sedimentary rock.
INTRO•Week WS #16:• Have you ever tried to build a sand castle at the beach?
Where do you think the sand came from?
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Sedimentary Rock
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Sedimentary Rock
• Sedimentary rock
• Strata
• Forms when sediments are compacted into a rock
• Most created at the bottom of oceans and lakes
• Can contain fossils of plants and animals
• Layers of rock
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Sedimentary Rocks
• 3 Types:– Clastic Sedimentary Rock
• Made of fragments of rocks cemented together by minerals
• Course-grained (rough)• Medium-grained• Fine-grained (smooth)• Can easily record
ancient animal footprints, wave ripples, and even raindrops!
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Sedimentary Rocks
• Chemical sedimentary rock
• Forms from solutions of dissolved minerals and water
• Dissolved material eventually crystallizes and forms minerals in the sedimentary rock
• Example:– Halite (salt) is found in
sedimentary rocks
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Sedimentary Rocks
• Organic sedimentary rock
• Forms from the remains of plants and animals
• Reacts with acid because of organic material
• Example:– Limestone forms when
coral becomes compacted and cemented
– Coal forms from partially decomposed plants buried deep underneath sediments
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Sedimentary Rock
• Summary:– How do sedimentary rocks form?– Describe the three types of sedimentary rock.
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Sedimentary Rock LAB
• Name & Type – use chart inside box
• React to Acid?– Drip one drop of acid
onto rock– Use magnifying lens to
watch closely for any fizzing or bubbling
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10 December 2012
OBJECTIVE: Describe the origin of sedimentary rock.
OUTRO
Why do you think raindrop impressions are more likely to be preserved in fine-grained sedimentary rock rather than in course-grained sedimentary rock?