Wind erodes surface rock formations. Fossils date back thousands of years. Small rocks are left behind when glaciers retreat. Older layers of rock are located above newer layers of rock.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Geologists have identified seven major tectonic plates at the surface of Earth. Which evidence best indicates that tectonic plates collide?
Possibilities:
- Wind erodes surface rock formations.
- Fossils date back thousands of years.
- Small rocks are left behind when glaciers retreat.
- Older layers of rock are located above newer layers of rock.

Older layers of rock are located above newer layers of rock.