The term 'Basalt Source' can be summarized as a source of LAVA. Basalt is an igneous rock that forms when molten LAVA cools and solidifies. It is the most common type of rock in the Earth's crust and is found in many different locations around the world. LAVA is molten rock that is expelled from volcanoes or fissures in the Earth's surface. It is composed of basaltic material and can be very hot, reaching temperatures of up to 1, 200 degrees Celsius.