1. Igneous to Sedimentary: Igneous rocks, formed from the solidification of molten magma or lava, can break down through weathering and erosion. The resulting sediments can be deposited and over millions of years, can eventually form sedimentary rocks, such as sandstone, limestone, or shale.
2. Sedimentary to Metamorphic: When sedimentary rocks are subjected to intense heat and pressure deep beneath the Earth's surface, they undergo metamorphosis and can transform into metamorphic rocks. Examples of metamorphic rocks include marble (from limestone), slate (from shale), and quartzite (from sandstone).
3. Metamorphic to Igneous: Metamorphic rocks can also melt due to extreme temperatures and pressure. When this happens, the molten rock rises and cools, forming new igneous rocks. For instance, gneiss (a metamorphic rock) can melt and form granite (an igneous rock).
4. Igneous to Metamorphic: Igneous rocks can directly change into metamorphic rocks without passing through the sedimentary phase. This happens when igneous rocks are exposed to high temperatures and pressures within the Earth's crust. An example is basalt (an igneous rock) that can be metamorphosed into amphibolite (a metamorphic rock).
It is important to note that the rock cycle is a continuous process, and rocks can cycle through these different types over millions or billions of years, driven by various geological forces.
