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.

Pumice is an extrusive igneous rock formed when gas is trapped in the cooling lava forming a vesicular texture. The rocks may have deposits of important minerals such as tungsten, tin, chromium ...

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 ...

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.

An extrusive igneous rock is formed from molten magma coming from the interior of the earth on its surface, rapidly cools down and becomes solid.

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 ...

Two hours east 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.

Granite colors range across the spectrum from white to black to pink, but what makes a single type of rock so variable?

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.