Volcano Research
There are three different types of magma that make up volcanoes. Once the magma erupts and then cools it creates rock. These three different types are:
- Basalt - magma often forms shield Volcanoes.
- Andesite - magma often forms cone Volcanoes.
- Rhyolite - magma often forms calderas - depending on how much gas the magma containe, but can also form cone Volcanoes too.
Satsuma-Iwo Jima volcano.
Iwo Jima volcano is made up of Rhyolite rock, "Rhyolite is light-coloured or white - this is a clue that the rock contains a lot of silica (More than 70%) and not much iron or magnesium."
Rhyolite is associated with lower temperatures between (750-850 degrees) and is often thick, which means that gas is unable to escape. It is also of a lighter colour sometimes almost white. For example, Pumice rick still has evidence that the has was still within the rock after it solidified.
http://sciencelearn.org.nz/Contexts/Volcanoes/Science-Ideas-and-Concepts/Types-of-volcanic-rock
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