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 ...

- Kirkland Lake Discoveries’ ALS GoldSpot MPASS geophysics survey identifies a potential intrusive complex with similarities to Agnico’s Upper Beaver deposit six kilometres to the southwest - A ground ...

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 ...