Disco's geology is noted by a single major continental plate on which all land mass resides. Dozens of other plates make up the ocean bottoms. These plates interact frequently causing regular undersea earthquakes and thermal venting.


The planet's crust is comparatively thin under the polar oceans. Fissures in the ocean bottom often lead to the escape of hot gases and magma into the water.

Disco's crust is comprised of rocks and minerals somewhat similar to Earth. All rocks are grouped into igneous, sedimentary and metamorphic types. One notable difference in crust composition is the high level of Iron (about 15%). The result is a reddish tint often found on land and the ocean floor.

Following is a breakdown of the elements and their percentage of the planet's crust:

Element Oxygen Silicon Iron Aluminum Potassium Sodium Calcium Magnesium Other Total
Percent of Crust 40% 21% 15% 7.8% 4.6% 3.9% 3.6% 3.1% 1% 100%

Mountain Formation

Many of Disco's larger mountains formed millions of years ago from volcanic activity. Mountains still form on land from the upward pressure of magma on the crust (dome mountains). Undersea mountains and valleys constantly form and fall from the converging of undersea plates (fold mountains).

1998 Martin Briner -