Respuesta :
True, sedimentary rock is formed by deposition.
What are sedimentary rock?
Sedimentary rock are made up of weathering of preexisting rocks, transport of the weathering products, deposition of the material, followed by compaction, and cementation of the sediment to form a rock. The latter two steps are called lithification. Weathering is there when there is breaking down rocks, soil, and minerals as well as wood and artificial materials by contacting the atmosphere, water, and biological organisms of the Earth. It should therefore not be confused with erosion involving the movement of rocks and minerals by agents such as water, ice, snow, wind, waves and gravity, and then transported and deposited elsewhere. There are 2 types of weathering - Mechanical weathering and chemical weathering.
As the procedure of weathering proceeds the products are carried off. The most important transporting product is water. Water carries or rolls particles in rivers, from the smallest suspended clay particles to the largest boulders. Sediments are transported only when there is enough energy in the transporting medium, for example, when a stream is flowing rapidly enough to carry a given size of sedimentary particle.
Steep mountain streams can move large boulders during spring flood but these boulders will never be transported out into a placid lowland river. So the largest sediments (boulders, cobbles, and pebbles) which survive the weathering process, tend to be deposited near to their source. As sedimentary continues, the deposited sediments are laden with an increasing overburden. They are compacted, reducing the available pore space and expelling much of the pore-water.
Dissolved minerals in the ground water precipitate (crystallize) from water in the pore spaces forming mineral crusts on the sedimentary grains, gradually cementing the sediments, thus forming a rock. Calcite (calcium carbonate), silica, and hematite (red iron oxide) are the most common cementing agents.
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