Volcanoes can look like small mountains or hills. A volcano is an opening in the Earth's crust that allows magma, hot ash and gases to escape. Composite volcanoes are the most common type of volcano.

This is the stadium at Olympia. It was built during the 4th century BC and it was the largest of its kind at the time. It could seat 50,000 spectators! The Olympic Games began over 2,700 years ago in ...