The Environment & Wildlife Community There are 3 types of rocks, namely: Sedimentary Igneous Metamorphic SEDIMENTARY ROCKS Sediment is produced through the process of weathering large rocks are broken down gradually and smaller pieces are transported by wind, water and ice. Under high temperature and immense pressure, sediments are smashed together and hardened into sedimentary rocks. This usually occurs as the sediment is buried deeply under layers of new sediment. Characteristics of Sedimentary Rocks They often contain layers and grains, and they may contain fossils (This is why some of the rocks look like they were engraved with shapes of particular types of fossils) Examples of Sedimentary Rocks sandstone, limestone and gemstone IGNEOUS ROCKS These rocks come from the coding of melted rock material which we call magma. METAMORPHIC ROCKS These were formerly igneous or sedimentary rocks which were buried deep in the Earth's crust, then they were transformed by their expo...