Which Type Of Rock Forms When An Existing Rock Changes Under Extreme Pressure And Intense Heat? A Igneous B Sedimentary C Metamorphic. The type of rock that forms when an existing rock changes under extreme pressure and intense heat is metamorphic. Igneous rocks form from the cooling and solidification of magma or lava,.

The type of rock that forms when an existing rock changes under extreme pressure and intense heat is metamorphic. To answer this, we need to understand the characteristics of the three main rock types: This process changes the mineral structure and often alters the appearance of the.