What does the word dike really mean (as in, not a derogatory term for lesbians, and not the scientific term either..)?? Answered

I was reading The Lord of The Rings, The Fellowship of The Ring (yeh, the first one).. Cause I've seen the movies, and have had the books for years, yet haven't read them. So I was reading, and the book came to describing the town Bree.. & I saw "there was a deep dike, with a thick hedge on the inner side." Anyone know what dike means (sorry, I can't help but feel awkward when saying/typing that word -_--)..? I just assumed it was some kind've trench, but is that correct? And I know there's something to do with Lava/Volcanoes/etc.. But I don't really think that would apply in this circumstance..

Question by Imgerome 10 years ago  |  last reply 10 years ago


Geology in action: A mid-ocean ridge you can visit on vacation!

UPDATE Jun 2011:  ScienceNews has a very nice feature about Afar, with an excellent narrative summary of items since the current spreading event began in 2005. UPDATE Nov 2009:  Science magazine only keeps their news articles free for a short time.  The link below requires paid access to read.  Wikipedia has an article on the volcano. A news article in this week's (May 2009) Science magazine online reports on a very unusual volcano. Located directly in the center of east Africa's Great Rift Valley, it is spewing a unique kind of lava. The Great Rift Valley is a place where one of Earth's tectonic plates is actively dividing in two -- the eastern tip of Africa and the Arabian peninsula is separating from the rest of Africa. In several million years there will be a brand new ocean (not a "sea") like the Atlantic, and the Great Rift Valley will become its mid-ocean ridge. This African volcano is essentially an example of the undersea volcanoes that run down the spreading center along the middle of the Atlantic (Iceland is a set of them that are above the ocean surface). If you want to see what was happening when the Atlantic Ocean was forming, and Brazil was being broken away from West Africa, go visit Ol Doinyo Lengai in Tanzania. ADDED:  Besides the world's only active (on land!) natrocarbonatite volcano, the Great Rift Valley also has examples of sheeted dikes forming and breaking through to the surface.

Topic by kelseymh 10 years ago  |  last reply 7 years ago


Where can I find a screwdriver for an Etch-A-Sketch Animator?

I have an old Etch-A-Sketch Animator from 1986. The rubber membrane buttons barely work now. I would love to take this apart and clean out the buttons but the security screws in this are very weird - a funky kind of three bladed thing for which I have never been able to find a bit/driver. It's not Tri-Lobe, Tri-Wing or Tri-Groove. It's a standard pan top screw with three slots, separated in the center by a tiny "triangle". The slots come together much more closely than Tri-Groove. The ends of the slots closest to the center of the screw are more shallow than the edges closest to the diameter of the screw. A Tri-Groove might work, but I don't think the driver is going to clear the outer plastic housing. If anyone knows where I can find a bit to remove these, I'd appreciate the help! As far as advice on improvised removal techniques: Dremel techniques or any kind of "use a pair of dikes" technique won't work here because the screw is recessed by about 1.5cm in a channel that is maybe 1mm wider than the screw head. I'd like to avoid "Melt a pen" techniques to avoid damage to the casing and/or getting a pen permanently melted into the shaft. Besides, with the size of these screws (1/4 inch head?) and the age of the device, I doubt a Bic pen will have the torque necessary to pop the screws. (Keeping that under my belt as a last resort, though.) Links to a recommended Tri-Groove set with plenty of differently sized bits would be awesome as a second to last resort. There's so many and I'm a bit out of my element.

Question by inanis 5 years ago  |  last reply 5 years ago