Question

how rocks are formed​

Answer 1

A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition and the way in which it is formed. Rocks form the Earth's outer solid layer, the crust, and most of its interior, except for the liquid outer core and pockets of magma in the asthenosphere.

Rocks are usually grouped into three main groups: igneous rocks, sedimentary rocks and metamorphic rocks. Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. Sedimentary rocks are formed by diagenesis or lithification of sediments, which in turn are formed by the weathering, transport, and deposition of existing rocks. Metamorphic rocks are formed when existing rocks are subjected to such large pressures and temperatures that they are transformed—something that occurs, for example, when continental plates collide.

The scientific study of the character and origin of rocks is called petrology, which is an essential subdiscipline of geology.

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Answer 2

The ock cycle is the process through which the many types of rocks found in the earth's crust are created and transformed.

Explanation:

• Melting, cooling, deforming, compacting, and eroding are some of the physical changes that occur during the formation of rock.
• When magma cools to the point where it can no longer be liquid, it transforms into igneous rocks.
• When igneous rocks are exposed to harsh natural conditions, such as weathering and erosion, they convert into sediments.
• Sedimentary rocks are formed when sediments become solid and cement together.
• When sedimentary rocks are exposed to heat and pressure for an extended length of time, they metamorphize.
• When metamorphic rock is exposed to high temperatures over an extended length of time, it melts, forming magma.
• When igneous rock is subjected to heat and pressure, it changes and recrystallizes in a continuous cycle, forming metamorphic rocks. Weathering and erosion will cause metamorphic rock to degrade into sediments.
• When igneous rocks reach a temperature where they can no longer maintain their solid state, they melt and produce magma.