6: Balancing rocks are a naturally occurring geological formation. 
 How do these rock formations support the idea that Earth has changed overtime due to natural processes? 
 A: They show how gravitational forces behaved long ago.
 B: They show how erosion has changed the Earth over time.
 C: They show how delicate the Earth is today compared to long ago. 
 D: They demonstrate that only Earth can create large rock structures.