Composite Volcanoes
- Composite volcanoes are made up of alternating layers of lava and ash (other volcanoes just consist of lava).
- They are usually found at destructive or compressional boundaries.
- The eruptions from these volcanoes may be a pyroclastic flow rather than a lava flow. A pyroclastic flow is a mixture of hot steam, ash, rock and dust.
- A pyroclastic flow can roll down the sides of a volcano at very high speeds and with temperatures of over 400°C.