How are sedimentary rocks used?

Scientists have used sedimentary rocks as vehicles to the reconstruction and improved understanding of earth history since the late 1400s! Sediments and sedimentary rocks are time capsules that record past events that have occurred at and near the surface of the earth for billions of years. read more

Sedimentary rocks cover 75% of the Earth's surface. Four basic processes are involved in the formation of a clastic sedimentary rock: weathering (erosion)caused mainly by friction of waves, transportation where the sediment is carried along by a current, deposition and compaction where the sediment is squashed together to form a rock of this kind. read more

Sedimentary rocks. There are three main types of rock: sedimentary, igneous and metamorphic. Formation of sedimentary rocks. A river carries, or transports, pieces of broken rock as it flows along. When the river reaches a lake or the sea, its load of transported rocks settles to the bottom. We say that the rocks are deposited. read more