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 ...

UB earth sciences students develop valuable fieldwork skills during a trip to New Hampshire to study igneous rocks and ...

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 ...

IIIF provides researchers rich metadata and media viewing options for comparison of works across cultural heritage collections. Visit the IIIF page to learn more. This is a large piece of a type of ...

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 ...

Researchers compiled previously published thorium-uranium ratios (Th/U) of more than 29,000 igneous rocks spanning the past 3 billion years and report 2 dramatic decreases occurring at approximately 2 ...

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, ...

A study established a quantitative fracture identification method for the igneous reservoir rock in the Xingcheng group of Xushen gas field, a field near Daqing in northeastern China. The method uses ...