How might a mountain bowl form?
On a world similar to Earth minus size, gravity, and a mildly different atmosphere. The weather is much more violent, causing frequent dust storms. The planet is larger than Earth and is mostly scrublands. However, there are certain geological formations, bowl mountains, that provide adequate shelter for forests. There are two large oceans on either side of the planet as well. They have much lower salt content than Earth's oceans do. The planet is made of lighter elements than Earth is, resulting in slightly stronger gravity.
Onto the bowl mountains. They are massive rings of raised rock (averageing 7,000 meters high) that surround a shallow dip in the center. The dips can have varying elevation levels. The mountain bowls can be anywhere from a Kilometer across to hundreds of kilometers across.
My question is: How might these bowl mountains form?
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