Register for an account


Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.


Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

The Sciences

Mystery Volcano Photo #24

Rocky Planet iconRocky PlanetBy Erik KlemettiJuly 14, 2010 12:33 PM


Sign up for our email newsletter for the latest science news

MVP 23 revealed ... and 24 introduced!

Mystery Volcano Photo #23 was, in fact, Middle Sister volcano in Oregon, part of the picturesque Three Sisters near Bend. Middle Sister is a partially eroded (by glaciers) composite volcano with a mix basaltic andesite to andesite lava flows and tephra deposits. Depending on who you speak with, Middle Sister gets lumped in with North Sister (as Middle Sister build up on the flanks of its slightly older sibling) or stands on its own as a part of the Three Sisters. However, before thinking Middle Sister is dormant, remember, the last eruption might have been as recent as ~440 A.D.

Current Standings: The Bobs - 3 Don Crain - 3 Boris Behncke - 3 gijs - 2 volcanista - 1 Lockwood - 1 Elizabeth - 1 Ralph - 1 Anne - 1 Cam - 1 gg - 1 Damon Hynes - 1 Marco - 1 Doug C. - 1 Diane - 1 Stephen - 1 MK, Alberta - 1 Kultsi - 1

And now, here is another mystery photo (and it might be a doozy).


Click on the image to see a larger version.

Good luck!

3 Free Articles Left

Want it all? Get unlimited access when you subscribe.


Already a subscriber? Register or Log In

Want unlimited access?

Subscribe today and save 50%


Already a subscriber? Register or Log In