Igneous rock is formed by the cooling and solidification of molten Earth materials. Igneous rock forms when magma or lava cools. If igneous rock forms above ground after a volcanic eruption, it cools quickly, forming extrusive igneous rock, such as obsidian which is a naturally occurring volcanic glass.
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Madhur L.
Rocks are mixtures of different minerals. Some are made up of many minerals while others are made of just one mineral. The minerals that make up rocks are called minerals. All rocks can be put into one of those fundamental categories based on their origin. Igneous rock got its name from a Latin word "ignis" which means fire. The parent material of igneous rocks is usually molten from deep within the Earth that cools and hardens. When igneous rocks are exposed at the surface, they begin to wear away. They are altered either by physical or chemical processes. Rainwater may fill cracks in rocks and eventually break them down. Sedimentary rocks are formed from sediments into hard rocks, a process of cementing soft, unconsolidated materials.
Adi S.
Which of the following rock types form from placing other rocks under heat and pressure? A. Sedimentary rock B. Metamorphic rock C. Intrusive igneous rock D. Extrusive igneous rock
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