The start of the rick cycle is the Transition to igneous rock, at which rocks are pushed deep under earths surface with a chance they will turn into magma. If the conditions no longer exists for the magma to stay in its liquid state, it will cool and solidifies into an igneous rock. When rocks are exposed to high temperatures and pressure can be changed physically or chemically called metamorphic rock. when rocks are exposed to the atmosphere are variably unstable and subject to the presses of weathering and erosion.weathering and erosion break down the original rock down into smaller fragments and carry away or devolve the material. These fragmented material accumulates and is bared by additional material While an individual grain of sand is still a member of the class of rock it was formed from, a rock made up of such grains fused together is sedimentary. My source is Wikipedia
