What caused the deep cracks in Caloris Basin's central lava plains?

The deep cracks in Caloris Basin's central lava plains were primarily caused by the weight of the lava flows. When the lava first erupted and spread across the basin, it created a thick layer of material. As the lava cooled and solidified, it underwent contraction, resulting in the formation of these cracks. The significant mass of the lava, combined with the thermal contraction as it cooled, exerted stresses on the surface that ultimately led to the cracking described.

This process illustrates the geological activity that characterizes planetary surfaces, especially those like Mercury that have experienced significant volcanic activity. Understanding the mechanism behind the formation of these cracks offers insights into the geological history of Mercury and the nature of its volcanic processes.