Final answer:
Europa's surface has been resurfacing through geological self-renewal, indicated by its young ice crust and few impact craters. The presence of oxidizing chemicals suggests a possible mixing between the surface and the ocean, contributing to the resurfacing.
Step-by-step explanation:
The surface of Europa has been resurfacing due to a process called geological self-renewal. Europa's surface is covered by a thick crust of ice and has very few impact craters. This suggests that the surface is geologically active and constantly renewing itself. The ice crust appears geologically young and the presence of oxidizing chemicals indicates that the surface and the ocean beneath may mix, further contributing to the resurfacing.