There are three basic rock types that make up the geology of the Earth. They are igneous rocks, sedimentary rocks and metamorphic rocks. The rock type is defined by the way the rocks were created.Know More
Igneous rocks are formed from molten material, such as lava or magma. When the molten material cooled, the minerals crystallized into a tightly packed structure, making these rocks very strong.
Sedimentary rocks are formed at the Earth's surface from materials like sand, clay and mud. These rocks form in layers and are typically brown to light gray. Because they were formed on the Earth's surface, sedimentary rocks often house fossils.
Metamorphic rocks are created when existing rock is exposed to heat and pressure. The heat and pressure alters the form of the existing material. Metamorphic rocks may be formed from sedimentary or igneous rocks.Learn more about Geology
The three major types of rocks are igneous, sedimentary and metamorphic. Formed deep inside the Earth, igneous rocks form when a melted rock cools and solidifies. This liquid rock is magma, and the rate of cooling determines the exact type of igneous rock formed.Full Answer >
To identify a rock, it is necessary to consider its luster, color, hardness, cleavage and density. The geographical location of the rock should also be used to help identify it.Full Answer >
All rocks fall into the three main categories of igneous, metamorphic or sedimentary. These rocks vary widely in physical appearance and location and their formation patterns differ, as well: igneous rocks form cooling magma deep within the earth's core. Activity within the core produces metamorphic rock and accumulations of silt, sand and other earthen debris that form sedimentary rocks along the earth's surface.Full Answer >
The three classes of rocks are sedimentary, metamorphic and igneous. The most significant differences found among these the three types have to do with how the rock is formed.Full Answer >