What’s hiding inside? Why Wyoming’s Devils Tower is still a geological mystery Standing tall at 1,267 feet in Northeastern ...

Pumice is an example of extrusive igneous rock. The word extrusive means that the magma was forced onto the earth's surface and cooled in a matter of hours. Granite is an example of intrusive igneous ...

Sedimentary rocks are made up of pieces of older rocks (igneous, metamorphic, and sedimentary) and organic remains (shells, bone, etc.). When rocks break apart from erosion they are transported by ...

There are three types of rock found on Earth. These are igneous, metamorphic and sedimentary. Each rock type is formed in a different way. For example, the rock malachite is mostly made of the ...

In my last column, I wrote about the locations where you can find igneous rocks that were formed from lava. The metarhyolite and metabasalt described in the column are known as extrusive rocks, those ...

This is a preview. Log in through your library . Abstract Speculation about igneous rock diversity began in the first half of the nineteenth century after acceptance of the existence of ancient ...

These rocks really shouldn't be there. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The surprising discovery of volcanic, "igneous," rocks by ...

A rock commonly found in the southeast corner of the Arabian Peninsula could be used to soak up carbon dioxide and slow down global warming, scientists say. When carbon dioxide comes in contact with a ...

ATTENTION has been directed in these columns to this now well-known text-book on two previous occasions. On May 14, 1891 (vol. xliv., p. 25), the first edition was reviewed at length, and on May 20, ...

Sam Walters is the associate editor at Discover Magazine who writes and edits articles covering topics like archaeology, paleontology, ecology, and evolution, and manages a few print magazine sections ...