The correct answers are:
- Thousands of lakes; all of the lakes are originated from glaciation, and pretty much every little whole it ground has become a lake after the end of the glacial period.
- Jagged coastline; the coastline has been formed by the movement of the glaciers and their pressure, so it's overloaded with fjords.
- Rocky soil; the erosion caused by the glaciers manifests in little pieces of rocks/rocky soil, because of their pressure on the rocks they break them and drag them downwards with them.
