Underground Molten Rock, also known as MAGMA (5 letters), is a hot, liquid or semi-solid material found beneath the Earth's surface. It is composed of molten rock, crystals, and dissolved gas. MAGMA is formed when the Earth's mantle melts due to extreme heat and pressure. It can be found in volcanoes, geysers, and other areas where the Earth's crust is thin. MAGMA is an important part of the Earth's geology and can be used to study the Earth's interior.