Based on the description of rounded rock formations with plant covering, the scientist could conclude that this area is likely a very young piece of land. The presence of plant cover suggests that the area has been stable enough for vegetation to grow, which typically indicates that the land has emerged relatively recently and may have gone through geological processes that shaped it into its current form. The rounded nature of the rock formations could also imply erosion and weathering that often occur in younger landscapes, contributing to the development of soil suitable for plant life.
While all of the other options pertain to geological processes, they do not directly align with the combination of exotic rock shapes and the presence of vegetation in a clear manner.