The name igneous comes from the word ignis, which means "fire" in Latin. Pumice is an example of extrusive igneous rock. The word extrusive means that the magma was forced onto the earth's surface ...

Igneous rocks are the "new kids" in the rock cycle. They're the new rock on the block, ready to start fresh. Basalt lava flow in Hawaii, a perfect example of an extrusive igneous rock.

The Rock Cycle is Earth's great recycling process where igneous, metamorphic, and sedimentary rocks can all be derived from and form one another. Analogous to recycling a Coke can, where an old ...

Two hours west of Portland on the outskirts of the Mount Hood National Forest, a 7,700-year-old mound of lava rocks rises 164 feet above the Hood River wine country. Stretching more than 4 miles ...

Extrusive. Extrusive igneous rocks are formed by magma that has erupted onto the surface as lava and then cooled quickly. Obsidian is an example of an extrusive igneous rock.

Basalt is what’s known as an extrusive igneous rock - it is volcanic, formed from molten magma that extruded onto the Earth’s surface and hardened. It is dark in color and heavy and dense.

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 ...

But as you note, inside an extrusive igneous rock is not that kind of environment. The naturally-occurring aluminum flakes in question were found in Bulgaria, ...

A recent study by researchers at the University of Hawaii, Manoa and the University of Rhode Island changes the understanding of how the Hawaiian Islands formed. Scientists have determined that it ...