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 ...

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 ...

It’s impossible for me to walk over a bridge without thinking “I’m going to chuck my phone into the water.” Luckily, I’ve never acted on this involuntary “intrusive thought.” And since I’m online all ...

Have you ever had an unwanted thought or image stuck in your head? Usually, you can ignore it and move on. But sometimes, it just keeps popping right back up. You don’t want to have these sticky, ...