Introduction Volcanoes are one of the most dangerous things on theplanet. They spray out lava and blast out ash, but morethan 8000 people live by and on volcanoes.
What is a Volcano? A volcano is a pipe into the mantle. Magma or meltedrock is forced up through a crack or fissure in theEarth’s crust. The lava then cools and as it builds up itbecomes a volcano.
Mauna Loa Mauna Loa is the biggest volcano in the world and isfound in Hawaii. It has been erupting constantly since1984. Mauna Loa can be viewed in action because ofseveral viewing platforms built around it.
The Ring of Fire The Ring of fire is a ring of volcanoes around the PacificOcean. Roughly 70% of all the active volcanoes in theplanet are in the Ring of fire.
Why do People live on Volcanoes? Many people live by and on volcanoes, such as theHawaiian islands. This is because of the nutritious soilwhich is healthy for crops. But living by or on a volcanois a very risky as the people of Pompeii discovered.The Hawaiian islands.
The Layers of the Earth The Earth has 4 layers: the crust, the mantle, the outercore and the inner core. The crust is the thinnest andmost brittle layer. The mantle is the thickest layer. Theouter core is an area of liquid iron. The inner core issolid iron and nickel 10x hotter then the sun.
The Tectonic plates The tectonic plates are sections of the Earth that areconstantly moving. These plates are floating betweenthe crust and magma. When the tectonic plates collidethey create an earthquake.