No, the answer is not igneous. The rock that results from the changes of heat and pressure in the Earth's crust is called gneiss. Gneiss is a type of metamorphic rock, meaning it has undergone transformation from a pre-existing rock due to geological processes such as heat, pressure, and chemical changes.
Metamorphic.
Gneiss forms when very high pressure an temperature are applied to existing rock . How might these conditions explain the wavy pattern in this rock ?
