1. Dome Mountains: These form when a large mass of magma rises from deep within the Earth's crust but doesn't erupt. The magma heats the surrounding rocks, causing them to expand and uplift, creating a dome-shaped structure. The Black Hills of South Dakota are an example of a dome mountain.

2. Fault-Block Mountains: These form when the Earth's crust is stretched and broken, creating a series of faults. As the crust stretches, blocks of rock drop down along these faults, leaving other blocks elevated. The Sierra Nevada Mountains in California are a good example of fault-block mountains.

It's important to note that while these mountains form far from plate boundaries, they are still ultimately related to tectonic activity. The rising magma that creates dome mountains is often a result of mantle plumes, which are areas of hot rock that rise from deep within the Earth. The stretching and breaking of the crust that creates fault-block mountains can also be caused by tectonic forces that are acting far from the actual plate boundaries.