limestone caverns marine fossils abrasion of surface rocks peeling slabs of rock
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is the best evidence that an area of land was once covered by a glacier?
Possibilities:
- limestone caverns
- marine fossils
- abrasion of surface rocks
- peeling slabs of rock

abrasion of surface rocks