Volcanoes - presentation by Sam G.Presentation Transcript
Facts about VolcanoesA volcano is a landform where molten rock erupts through the surface of the planet.What is the difference between lava andMagma? Magma is liquid rock inside a volcano. Lava is liquid rock that flows out of a volcano. Fresh lava ranges from 700° to 1,200° C in temperature and glows red hot to white hot as it flows.
What are the three layers theEarth is made of?Crust The crust is the outer layer of Earth. It is about 18 miles thick. It is the part we live on.Mantle The second layer is called the mantle. It is about 1,800 miles thick.Core The inner layer is called the core.
How many volcanoes arethere in the world?There are around 1510 activevolcanoes in the world. We currentlyknow of 80 or more which are underthe oceans.