GLOBAL VALCANO

How Volcanoes are Formed Volcanoes usually form in places where tectonic plates meet. There are three main formations: 1. Convergent boundaries – plates collide and one goes under the other. 2. Divergent boundaries – plates move apart and magma rises. 3. Hotspots – magma rises from deep inside the Earth at a fixed point (e.g., Hawaii).

  1. Shield Volcano Wide and gently sloping Lava flows easily Example: Mauna Loa in Hawaii 2. Stratovolcano (Composite Volcano) Steep and tall Explosive eruptions Example: Mount Fuji in Japan 3. Cinder Cone Volcano Small and steep Made mostly of ash and rock Short-lived eruptions

 1. Magma :  This is hot, molten rock from the Earth's interior . When it erupts onto the Earth's surface, it is called lava. 2. Lava :   When magma erupts onto the Earth's surface, it becomes very hot. As it cools, it hardens, forming a series of precious solids that form volcanoes . 3. Crater :  The top of a volcano, where lava and gases erupt. This is a deep, circular depression. 4. Volcanic Gas :   When a volcano is active, hot gases such as water vapor, carbon dioxide, sulfur dioxide , and other gases are released. 5. Plug :  This is a mass of cooled lava accumulated at the mouth of the volcano, which can sometimes stop the volcano from erupting.