BSL Geography Glossary - Crater - definition
Definition: At the top of a volcano there is often a crater, which is a bowl-like depression. There may be lava or magma in or underneath the crater, but the crater is made of hard rock. Over time, rain water might collect in a crater and form a lake. If a volcano is active and erupts, it’s likely that lava will erupt out from the crater. If a volcano is extinct, or dead, there will be no more eruptions.