volcanoes

• Volcanoes are mountains formed by lava (molten rock) from below the Earth's crust being forced up through gaps in the plate boundaries.
• A volcano is formed when there is a weakness in the earth's crust where magma can escape from the mantle forming a cone- shaped structure with a central vent or pipe.
• At the top of a volcano there is a funnel-shaped depression or crater.
• Molten rocks are known as magma
• When magma reaches the earth's surface it is called lava.