A magma chamber is a large underground pool of molten rock, known as magma, located beneath the Earth's surface. These chambers form when magma rises from the mantle and collects in pockets within the Earth's crust. The pressure and temperature in these chambers can be extremely high, allowing the magma to remain in a liquid state. When the pressure in a magma chamber becomes too great, it can lead to volcanic eruptions. During an eruption, the magma is expelled through volcanoes, resulting in lava flows, ash clouds, and other volcanic materials. Understanding magma chambers is essential for predicting volcanic activity and assessing potential hazards.