Volcano is an opening in the Earth's crust through which molten rock, ash, and gas can escape. Volcanoes can be found on land and under the sea, often forming mountains. When a volcano erupts, it can release lava, ash, and gases that can cause widespread damage to surrounding areas.

Volcanoes are formed by the movement of tectonic plates, which can cause the Earth's crust to break and create a weak spot through which magma can reach the surface. Some volcanoes are active and can erupt frequently, while others are dormant or extinct and have not erupted in many years, or centuries even.

Volcanoes have been an important part of the Earth's natural history and have played a significant role in shaping the planet's geography and climate over millions of years. Volcanoes are also an important source of geothermal energy, which can be harnessed for electricity generation and other applications. However, they can also pose significant hazards to human life and property in the event of an eruption, and it is important to monitor and prepare for such events.