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The key word here is 'form'. Sedimentary rocks can be broken down into three informal groups. The first group is known as siliciclastic, or just as clastics and these include rocks like sandstone, shale, and conglomerates. These rocks are transported and deposited by water, wind, or gravity. Eventually when they are buried under enough pressure they will become lithified by diagenesis. That is a process that 'cements' them together. They are also described as allocthonous, meaning they originated in a different place from where they were deposited.

The second informal group of sedimentary rocks are carbonates. Carbonates include limestone and dolomite. These rocks are mostly built by living organisms. Shells from marine organisms, corals, and many algaes all form carbonate rocks. Some but not all carbonates are autochthonous, meaning they originated in the place they were found. Carbonate rocks often form as rock quite quickly and undergo various stages of later diagenesis. The key thing to remember about carbonate rocks is they were "born" and not just transported like clastics. Most carbonates are formed in the ocean.

The third informal group of sedimentary rocks are called chemical sedimentary rocks. These form by evaporation or precipitation from water, so at some point they were completely dissolved. Examples of this type of rock are gypsum, halite (sodium chloride salt), and sylvite (potassium chloride salt). These rocks can form under certain ocean conditions or in places like dry lakes where the evaporation leaves them behind.

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Related Questions

Can Metamorphic rocks can form from igneous but not from sedimentary rocks.?

Metamorphic rocks can form from both igneous and sedimentary rocks


Can metamorphic rocks can form from igneous but not from sedimentary rocks?

Metamorphic rocks can form from both igneous and sedimentary rocks


What are ways sedimentary rocks can form?

1. Organically. 2. Mechanically. and 3. Chemically.


What do sedimentary rocks form from?

Sedimentary rocks form from a few different things. Sedimentary rocks form from sediment is deposited out of air, ice, wind and gravity.


All of the following are ways in which sedimentary rocks form execpt?

lava cooling


Are sedimentary rocks formed from fragments of other rocks chemical sedimentary rocks?

No, sedimentary rocks formed from fragments of other rocks are called clastic sedimentary rocks. Chemical sedimentary rocks form from minerals that are dissolved in water and precipitate out to form rocks like limestone or halite.


How are clastic sedimentary rocks different from organic sedimentary rocks?

they form


What are three ways sedimentary rock forms?

Three main ways and are classified accordingly. Igneous rocks form from molten material called magma.


What type of rocks can contain fossils on them?

Sedimentary rocks. and metamorphic rocks made form sedimentary rocks.


What else can sedimentary rocks form from?

All rocks can form from sedimentary because the rock cycle is endless.


What is the or-gin of sedimentary rocks?

weathering of preexisting rocks form clastic sedimentary rocks, Oversaturated water basins form chemical sedimentary rocks after the water evaporates and dead sea organisms settle at the bottom forming biochemical sedimentary rocks.


What type of rocks weather and erode to form sedimentary rocks?

Igneous, metamorphic, and existing sedimentary rocks can weather and erode to form sedimentary rocks. Igneous and metamorphic rocks can break down into sediments through processes like weathering and erosion, which then may accumulate and lithify into sedimentary rocks. Existing sedimentary rocks can also be reworked and lithified to form new sedimentary rocks through processes like compaction and cementation.