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

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 ...

THE direction of remanent magnetization of igneous rocks has recently been examined in detail 1 in order to investigate the secular variation in the geomagnetic field, and its relation to the ...

The chemical makeup of mineral inclusions preserved in impact glass hints at the site of a missing impact crater.

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.

The rock was then worked again ... at periods when no I volcanic eruption precedes, corresponds with,; or follows after. The igneous theory may be I true, but it certainly does not account ...

Petrology is the study of rocks - igneous, metamorphic, and sedimentary - and the processes ... At CU Boulder, we use petrology to study the formation of volcanoes and their magmatic sources, the ...