Mount Etna, a volcano in Sicily, erupted on Monday. Smoke and ash went high into the air. The airport in Catania was more careful, but flights were not stopped. In the afternoon, the smoke stopped. The volcano erupted because part of it broke. Hot lava flowed, but people were safe. Tourists could not go to the top of Mount Etna. People in towns nearby saw the eruption, and they talked about it online. Many people visit Etna because it is tall and big.