Question

Facts on The ROCK???​

Answer 1

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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 are usually grouped into three main groups: igneous rocks, metamorphic rocks and sedimentary rocks. Rocks form the Earth's outer solid layer, the crust.

Igneous rocks are formed when magma cools in the Earth's crust, or lava cools on the ground surface or the seabed. The 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 sedimentary rocks are formed by diagenesis or lithification of sediments, which in turn are formed by the weathering, transport and deposition of existing rocks.

Answer 2

Answer:

Rocks are classified in three types based on how they are formed.

1. Igneous rocks are formed when molten rock (magma) from within Earth cools and solidifies.

There are two types:

• Intrusive igneous rocks solidify beneath Earth's surface;
• Extrusive igneous rocks solidify at the surface.

Examples: Granite, basalt, obsidian

2. Sedimentary rocks are formed when sediment (bits of rock plus material such as shells and sand) gets packed together. They can take millions of years to form. Most rocks that you see on the ground are sedimentary.

• Examples: Limestone, sandstone, shale

3. Metamorphic rocks are sedimentary or igneous rocks that have been transformed by heat, pressure or both. Metamorphic rocks are usually formed deep within Earth, during a process such as mountain building.

• Examples: Schist, marble, slate