What do opals and Yellowstone, the world’s most famous supervolcano and national park, have in common? Opal, a hydrated silica, is closely related to
Hydraulic fracturing – fracking – is a technique used with directional drilling that lets us tap deeply buried oil and gas formations. While it’s
One of my favorite XKCD comics:
Update, July 15, 2018: I thought of this five-year-old post tonight when seeing this tweet: Red Sprite Lightning Taken by Paul Smith on July 14,
. . . and it will reward you with wonders. Popocatépetl volcano in Mexico is currently in an active phase and I am live-blogging that.
Note: A version of this article appeared on Helium, June 15, 2011. Limestone is a calcium-based rock that has many uses in daily life.