An eruption is a geological event where materials from inside the Earth, such as lava, ash, and gases, are expelled through a volcano. This process can occur suddenly and can vary in intensity, from gentle lava flows to explosive blasts. Eruptions can reshape landscapes and impact the environment, affecting air quality and climate. Volcanic eruptions are often classified into different types, including effusive eruptions, which produce flowing lava, and explosive eruptions, which release ash and gases violently. Famous eruptions, like the one from Mount Vesuvius in 79 AD, have had significant historical impacts, burying cities and altering ecosystems.