Sedimentary Rocks

Sedimentary rocks have many more different types that Igneous rocks because they can be made up of many different types of rocks forming layers across thousands to millions of years!

Sedimentary rocks are types of rock that are formed by the accumulation or deposition of small particles and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water at the Earth’s surface.

Sedimentary rocks are formed by the accumulation of sediments. There are three basic types of sedimentary rocks. Below are 3 Main types:

Clastic sedimentary rocks such as brecciaconglomeratesandstonesiltstone, and shale are formed from mechanical weathering debris.

Chemical sedimentary rocks, such as rock salt, iron orechertflint, some dolomites, and some limestones, form when dissolved materials precipitate from solution.

Organic sedimentary rocks such as coal, some dolomites, and some limestones, form from the accumulation of plant or animal debris.

Advanced introduction into Sedimentary rocks


Below are listed some of the uses of igneous rocks. Make a new (or continue from igneous rock) word document or PowerPoint on your computer. Try to find some images and list the properties of the rocks that make them suitable for the use. e.g. granite has large coarse crystals which allow it to bear a lot of weight and it can also be polished smooth to make it look good.

To complete this task you should:

  • have at least one image of each type of rock listed
  • describe in your own words what it looks like
  • discuss 2 key features as to why it is used for that purpose