The Arenal Volcano is active since 1968, it constantly ejects gases, water, fumaroles and explosions with pyroclastic material emissions, and sometimes the eruptions are accompanied with powerful thunders.

The ash is carried by the wind over long distances especially to the northwest area of the volcano. The biggest and heaviest material falls close to the crater.

The lava flows come out of the crater with a temperature of about 1 000 Centigrade. As the lava flows down it slowly cools off.