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 ...

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Southern China is unusual in that respect: fossil-bearing marine limestones and the volcanic rocks of the Emeishan large igneous province can be studied in the same outcrop sections. This setting ...

About 400 kilometres northwest of Sydney, just south of Dubbo, lies a large and interesting body of rock formed around 215 ...

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 ...

but instead found volcanic rock. The Midnight Volcano is situated under the Mississippi Delta. The dense igneous rock below ...