Which type of rock is formed as a result of temperature and pressure changes without melting?

Which type of rock is formed as a result of temperature and pressure changes without melting?

• A. Metamorphic rock
• B. Sedimentary rock
• C. Igneous rock
• D. Basalt rock

Answer: (A)

Metamorphic rock is formed through the alteration of existing rock types, such as igneous, sedimentary, or even other metamorphic rocks, as a result of increasing temperature and pressure conditions. This process, known as metamorphism, causes physical and chemical transformations in the rock without the rock actually melting. Common examples of metamorphic rocks include schist, gneiss, and marble. In contrast, sedimentary rock is formed from the accumulation and compaction of mineral and organic particles, while igneous rock is created through the cooling and solidification of magma or lava. Basalt is a specific type of igneous rock that forms from rapidly cooling lava at the Earth’s surface. Understanding these processes highlights the distinct nature of metamorphic rocks, which uniquely arise from heat and pressure rather than melting.

Metamorphic rock is formed through the alteration of existing rock types, such as igneous, sedimentary, or even other metamorphic rocks, as a result of increasing temperature and pressure conditions. This process, known as metamorphism, causes physical and chemical transformations in the rock without the rock actually melting. Common examples of metamorphic rocks include schist, gneiss, and marble.

In contrast, sedimentary rock is formed from the accumulation and compaction of mineral and organic particles, while igneous rock is created through the cooling and solidification of magma or lava. Basalt is a specific type of igneous rock that forms from rapidly cooling lava at the Earth’s surface. Understanding these processes highlights the distinct nature of metamorphic rocks, which uniquely arise from heat and pressure rather than melting.