Igneous rock that forms when magma is injected into rock then cools and become hard.

a) faults

Explanation:

The two main categories of igneous rocks are extrusive and intrusive. Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

Take a cow for example. Scientists will use a cow's stem cells, the building blocks of muscle and other organs, to begin the process of creating the cultured meat. The cells are placed in petri dishes with amino acids and carbohydrates to help the muscle cells multiply and grow.