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 ...

About 400 kilometres northwest of Sydney, just south of Dubbo, lies a large and interesting body of rock formed around 215 million years ago by erupting volcanoes.

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 ...

Igneous rocks form from the solidification ... Look for rounded, nodule-like formations embedded in the volcanic ash or soil. Carefully extract them from the surrounding material, taking care ...

No matter how many missions to Mars she takes part in, the sheer joy of unearthing discoveries about the red planet never gets old for Mariek Schmidt.

Volcanic rock is formed when lava or magma cools down and becomes a solid. We call this type of rock igneous rock. Here are three different types of igneous rock from the Museum’s collection.

Petrology is the study of the macroscopic and microscopic mineralogical and chemical composition of rocks. In addition to assessing sedimentary, igneous ... sampling of volcanic ash during ...