Final answer:
Metamorphism is a geological process that involves changes in rocks due to heat and pressure. This process results in the formation of metamorphic rocks with altered mineral composition and texture.
Step-by-step explanation:
Heat and pressure are the main factors involved in the metamorphic process. When rocks are subjected to high temperatures and pressures, their minerals can undergo recrystallization, resulting in the formation of a new rock with changed mineral composition and texture. This process is known as metamorphism. Examples of metamorphic rocks include marble, slate, and gneiss. Other processes mentioned, such as melting, sedimentation, and cooling and solidification, are not related to metamorphism.