With our ideas of volcanoes we always associate the grand and the terrible ; and a volcanic eruption—a huge piece of artillery, with a mouth perhaps miles in circumference, shooting up rocks and ...

That’s the channel inside a volcano that opens up to the surface. As it cools it becomes a very hard type of igneous rock. This one first formed over 350 million years ago. Then, millions of ...

Igneous rocks are formed when magma underground or lava from a volcano cools and crystallizes into solid material. These rocks are mostly made of silicate minerals that crystallize at temperatures ...

The class can give an erupting-volcano hand action or a trembly-earthquake action to answer. Volcanic rock is formed when lava or magma cools down and becomes a solid. We call this type of rock ...

Our latest research on Australian volcanoes, published in Communications Earth and Environment, shows how tiny crystals formed inside volcanoes offer ... and crystallizes in the crust, it can form ...