How Sedimentary Rocks are Formed. Sandstone. An area of sand is deposited. The sand is made of loose particles. The particles are compacted over time. A matrix is introduced to the sand. . Over time, the particles are cemented together. . A layer of sandstone is formed. . Shale.
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Calcium ( shells.Ca) from the shells is dissolved into the sea water.
Live fish breathe out carbon dioxide ( shells.CO2) into the water.
Calcium ( shells.CA) mixes with the carbon dioxide (CO2) to form………………
Over time, the weight of the sea water compacts the calcite, clay, and sand.