1) ~ Answer is D ( Erosion). In earth science, erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust.
4) ~ Answer is A ( rock wearing down due to acid rain)
11) ~ Answer is C, there was no life during that period of time.
1. erosion 2. d and c 3. stromatolites 4. bites being blown off a rock by heavy winds 5. how old the earth is and how many eras 6. global cooling 7. bleaching effect 8. oxygen capturing electrons 9. dissolves rock into a solution 10. deeper and wider 11. few fossils