Question

igneous;sedimentary and metamorphic rocks are usually composed of of​

Answer 1

Answer:

substance with a definite chemical composition and ordered atomic structure. Rocks are usually composed of several minerals. Rocks may be divided into three primary categories: igneous, sedimentary, and metamorphic. Igneous rocks are formed from cooling and solidification of molten rock.

Explanation:

Answer 2

Answer:

• Igneous rocks form from molten rock deep within the Earth.
• Layers of sand, silt, dead plants, and animal skeletons combine to form sedimentary rocks.

• Metamorphic rocks are formed from other rocks that have been altered by underground heat and pressure.

Each of these rocks is formed by physical changes that occur as part of the rock cycle, such as melting, cooling, eroding, compacting, or deforming.