: Because the magma is trapped underground, it cools very slowly over millions of years, allowing large mineral crystals—often granite —to grow.
: Molten rock (magma) rises from deep within the mantle but fails to erupt as a volcano. batholith
: A batholith is rarely one single rock; it is usually a cluster of multiple smaller igneous bodies called plutons that have merged together. : Because the magma is trapped underground, it
A is a massive body of intrusive igneous rock that forms when a large volume of magma cools and solidifies deep beneath the Earth's surface. Derived from the Greek words bathos (depth) and lithos (rock), it literally means "deep stone". These formations are defined by having a surface exposure of at least 100 square kilometers (about 40 square miles). How They Form A is a massive body of intrusive igneous