This document provides information about volcanoes. It explains that volcanoes are formed when magma forces its way through cracks in the Earth's crust. The melted rock that spills from the volcano's crater is called lava. Volcanoes can take cone shapes but also other shapes. They typically form on land but some underwater volcanoes emerge from the ocean. The document describes the different types of volcanoes based on their eruption patterns and provides some additional facts about volcanoes.