A magma chamber is a large underground pool of molten rock, known as magma, located beneath the Earth's surface. This chamber forms when magma accumulates in a specific area, often beneath a volcano. The pressure and heat in the chamber can cause the magma to rise toward the surface, leading to volcanic eruptions. When the pressure in a magma chamber becomes too great, it can result in an explosive eruption, releasing lava, ash, and gases. The size and composition of the magma chamber can influence the type of eruption and the characteristics of the resulting volcanic landforms, such as shield volcanoes or stratovolcanoes.