Igneous rocks are those that solidify from a molten or partially
molten state. These rocks are characterized as either extrusive or intrusive.
Erosion and deposition play a key
part in the formation of sedimentary rocks. Wind, water, ice, and chemicals
break down existing rock into sediment that is then transported and deposited
by wind, water, and glaciers.
As sediment accumulates with time (thousands of years) it becomes
compacted and cemented (lithified), eventually forming rock. Over a period
spanning hundreds of millions of years, oceans, rivers, and great deserts
covered Utah and deposited the sediment that has lithified into the sedimentary
rocks we see today. Some common sedimentary rocks are shale, sand
Metamorphic rocks are any rock
type that has been altered by heat, pressure, and/or the chemical action of
fluids and gases. Metamorphic rocks are classified by their structure and their
dominant minerals. Metamorphic rock structure is either foliated (has a
definite planar structure) or nonfoliated (massive, without structure).
stone, limestone, and conglomerate.