The highlands ringing Mare Imbrium are a typical lunar mountain chain. How is it believed they were formed?
A) by shrinkage of the crust as the Moon cooled
B) by impact
C) at a convergent boundary between lunar tectonic plates
D) by volcanism

Question

Quizplus · Accepted Answer

The highlands ringing Mare Imbrium are believed to have been formed by the impact of a large object on the Moon's surface. This impact created a massive crater, which was subsequently filled with basaltic lava flows to form the mare, while the surrounding highlands were uplifted by the force of the impact.

The Highlands Ringing Mare Imbrium Are a Typical Lunar Mountain