Igneous, Sedimentary, Metamorphic
Each of the rocks form in a different way.
Clastic, organic, and chemical rocks ~Isabelle (6th grader)
Some examples of igneous rocks not belonging to the three major families (basalt, granite, andesite) include obsidian, pumice, and tuff. These rocks form from unique cooling conditions or compositions, leading to textures and mineral content that differentiate them from the more common igneous rock types.
Organic, Chemical and clastic.
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The three major rock groups that change by natural forces are igneous rocks, which form from the cooling of magma and can be weathered into sedimentary rocks; sedimentary rocks, which can be compressed and heated to form metamorphic rocks; and metamorphic rocks, which can be melted to form magma and cool into igneous rocks.
The three major types of rocks are igneous, sedimentary, and metamorphic. Igneous rocks form from the cooling and solidification of magma or lava. Sedimentary rocks are formed from the accumulation and compression of sediment over time. Metamorphic rocks are formed from the alteration of existing rocks due to high heat, pressure, or chemical processes.
The three major groups of rocks have several things in common. The mineral composition is the same and this is why they will all turn into each other at some point.
Classics
Agree. Sedimentary, igneous, and metamorphic
The three major processes that continue to alter crustal rocks today are weathering, erosion, and metamorphism. Weathering breaks down rocks into smaller particles, erosion transports these particles to new locations, and metamorphism changes the mineral composition and texture of rocks due to high pressure and temperature.
The three major classes of rock that you would expect to find as bedrock in Mount Shasta are metamorphic rocks, igneous rocks (such as andesite, dacite, and basalt), and sedimentary rocks. Metamorphic rocks would likely include schist, gneiss, and marble, while igneous rocks might be found in the form of lava flows and volcanic rocks. Sedimentary rocks like limestone and sandstone could also be present in the region.