volcanoes

Here they are listing 210 reasons/theories for the collapse of the Rome, would volcanoes make reason #211?

Giant Snowden busts should look really great as the next generation of science fair soda volcanoes.

Let's concetrate on constructing robot-powered orbital space stations, and worry about the volcanoes later.

Your comment on eroded volcanoes made me wonder if water on Pluto acts a lot like rock on Earth and if there are water volcanoes that result from sub-surface heat transforming water into liquid.

Or are there much larger sources of CO2 that I'm unaware of (for example the ocean, or volcanoes).

Inland, the Cascade volcanoes mark the line where, far below, the Juan de Fuca plate is heating up and melting everything above it.

In fact, they made a point of comparing human driven emissions (which includes things like transportation and agriculture) to natural sources (eg volcanoes).

If I had to guess I'd say that the mounds are related to the water volcanoes we saw earlier.

Third, one of them just happened to strike where these volcanoes were active.

The place smells like sulphur, kinda like what you find near volcanoes.

Somehow those volcanoes just arrived in this conversation out of the blue.

I just mentioned volcanoes as another example for hazardous environments that people still voluntarily live in.

...variations include "why can't we put garbage in the sun", "why can we put nuclear waste in volcanoes", etc.