How Sedimentary Rocks are Formed
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Transcript of How Sedimentary Rocks are Formed
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How Sedimentary
Rocks are Formed
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Sandstone
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An area of sand is deposited.
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The sand is made of loose particles
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The particles are compacted over time.
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A matrix is introduced to the sand.
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Over time, the particles are cemented together.
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A layer of sandstone is formed.
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Shale
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A basin is a low area of land.
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Sometimes, a basin can be flooded by high water.
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This water can contain particles of silt and clay.
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This becomes an area of shallow, slow moving water.
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Plants and dead organisms are absorbed into the clay and silt.
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Over time,the water evaporates and the clay dries to become shale.
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Limestone
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Fish and shell creatures have calcium in their bones and shells.
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These organisms die and settle to the sea floor.
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Calcium (Ca) from the shells is dissolved into the sea water.
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Live fish breathe out carbon dioxide (CO2) into the water.
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Calcium (CA) mixes with the carbon dioxide (CO2) to form………………
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CALCITE
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Calcite settles to the bottom and mixes with sand and clay.
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Over time, the weight of the sea water compacts the calcite, clay, and sand.
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The sediments eventually compact enough to form solid rock – Limestone.