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I was watching a documentary about volcanos the other day and it got me thinking: what if Canterlot was unknowingly built on a volcano?
 
There is evidence that supports what I think, and one piece of evidence is the “Crystal Caves” below Canterlot. Crystals are often formed, and found, in volcanic tubes.
 
Not only that, but there was even a mine shaft that Princess Cadance and Twilight used to escape the Crystal Caves!
 
Thinking about how Canterlot might have been built on a volcano, I started thinking about the mountain named “Smoky Mountain” just outside of Ponyville that the mane six had to climb in the episode “Dragonshy.”
 
I believe that mountain is actually another volcano. There is also evidence to support this theory as well! What is this evidence of mine (besides the name) you ask? Three words: Sweet Apple Acres.
 
The Apple Family claims to have the best tasting apples in all of Equestria, and I wouldn’t doubt it! Volcanic soil is very rich in nutrients, and that is why their trees grow so well and the apples taste so good!
 
If you can recall in the episode “Family Appreciation Day,” we learn that Princess Celestia gives the Apple Family that land to build a farm.
 
Granny Smith: And as if the beauty of that city wasn’t enough, suddenly, she appeared. Princess Celestia, the most regal of all ponies. When lo and behold, she stopped to look at my pa’s seed collection. Then Princess Celestia saw that we were plumb-tuckered and hankerin’ to find our forever home. And bein’ a royal Princess and all, she knew exactly the place for us to lay down our stakes.
 
That fits way too well to just be a coincidence, don’t you think?
 
Then I got to thinking, two different volcanos right next to eachother is rather strange… unless the volcanos were formed from two tectonic plates meeting at a convergent boundary. With this type of boundary, a chain of volcanoes often forms parallel to it, along with a mountain range.
 
If you look at the map of Equestria, there is a mountain range connecting the two.
 
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There is even a mountain named “Smoky Mountain” for goodness sake!
 
What do you all think of this theory of mine? Is there enough evidence for you to believe this theory?
 
Or do you think I am looking to deep into this?

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Not a Llama - Happy April Fools Day!
Artist -

Another bit to the theory. Celestia is basically bound to the sun. A dormant (and unlikely to be extinct) volcano as a home would be the closest thing she’ll ever get to her element without getting out of Equestria at all.  
Add Solar Flare (corrupt Celestia) to this scenario, and Equestria is now hell.
Dustin Lange

The Indus Suture Zone represents the northern limit of the Himalaya. Further to the North is the so-called Transhimalaya, or more locally Ladakh Batholith, which corresponds essentially to an active margin of Andean type. Widespread volcanism in this volcanic arc was caused by the melting of the mantle at the base of the Tibetan bloc, triggered by the dehydration of the subducting Indian oceanic crust.
 
source
 
There may have been a small ocean/sea in between the south and north plates before the two continental plates met, causing volcanoes to form.
Background Pony Number 17
My Little Pony - 1992 Edition

@Dustin Lange  
Note that your citation says, “If one of the colliding plates is topped with oceanic crust…” That would be the volcano-forming case. But that’s not the case you’ve drawn on your map. That shows two plates topped by continental crusts, like the convergent boundary that forms the (non-volcanic) Himalayas.
Somber Star
Whatever bird that's dumber than a duck. Imagine I made the effort to research that and make a new badge for it. - Either a complete retard or a full time moron, it's hard to tell which and frankly I don't care either way

@Cirrus Light  
$400 is a lot when you’re unemployed. I have a disability income of $1300 a month, and most of that goes into rent and bills. I’ve recently started the process of getting into a well-paying job, but it’s a long process.
Cirrus Light
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Sciencepone of Science!
@Somber Star  
Not necessarily. Explore options and prices more and do some research, I’m sure you could find something that works. It may seem hard to afford now, but it’ll be even harder to afford during an emergency.
 
In less than five minutes, just on my phone, I found a 2 month supply at $407. Given some time and searching I’m sure you could do even better, and keep in mind you don’t need to get it all at once. You can make it kinda like a payment plan getting a little at a time. Don’t forget water purifiers, though.
 
Also; even if no natural disaster, economic collapse, depression, recession, or even just unemployment are things that could make you glad you got it.
 
 
Ehck. How did people keep… “things” clean before toilet paper?…
Somber Star
Whatever bird that's dumber than a duck. Imagine I made the effort to research that and make a new badge for it. - Either a complete retard or a full time moron, it's hard to tell which and frankly I don't care either way

@Cirrus Light  
Uh no. You don’t quite understand how America handles emergencies. We have an entirely reactive approach to them. Also, despite being fairly well off (at least for the lower class), I don’t have the spare money for stocking up for a disaster. Even if I did, I live in an apartment which I’ll be moving out of soon, so I have nowhere to store anything. Preparedness is the luxury of homeowners.
Cirrus Light
Economist -
Condensed Milk - State-Approved Compensation
Friendship, Art, and Magic (2018) - Celebrated Derpibooru's six year anniversary with friends.
Helpful Owl - Drew someone's OC for the 2018 Community Collab
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Best Artist - Providing quality, Derpibooru-exclusive artwork
Magical Inkwell - Wrote MLP fanfiction consisting of at least around 1.5k words, and has a verified link to the platform of their choice
Not a Llama - Happy April Fools Day!
Friendship, Art, and Magic (2017) - Celebrated Derpibooru's five year anniversary with friends.
An Artist Who Rocks - 100+ images under his artist tag

Sciencepone of Science!
@Somber Star  
That’s disturbing news. Well, emergency preparedness: do you have months or a year of food storage? Water purifiers? Lots of extra gas for your car, if you live in the Northwest? At the very least, surgical masks would go a long way for ash. See: “Supervolcano.”
Dustin Lange

@dekutree64  
Your comment made me do some more research and led me to find this:
 
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I believe that this is what the boundary would look like from a topographical view, but with the plates moving towards each other, not away.
dekutree64

Cool theory :) Might get more discussion if you post it on mlpforums.
 
What about the crystal mountains? Old/no longer growing? Or is the northern plate not moving, and being squeezed from both sides?
 
If Canterlot mountain does erupt, the trains will be the first to know :p
Dustin Lange

@Background Pony Number 17  
This is taken from this website: Link
 
When two plates come together, it is known as a convergent boundary. The impact of the two colliding plates buckles the edge of one or both plates up into a rugged mountain range, and sometimes bends the other down into a deep seafloor trench. A chain of volcanoes often forms parallel to the boundary, to the mountain range, and to the trench. Powerful earthquakes shake a wide area on both sides of the boundary.
If one of the colliding plates is topped with oceanic crust, it is forced down into the mantle where it begins to melt. Magma rises into and through the other plate, solidifying into new crust. Magma formed from melting plates solidifies into granite, a light colored, low-density rock that makes up the continents. Thus at convergent boundaries, continental crust, made of granite, is created, and oceanic crust is destroyed.