Answer:
1) weathered
2) depositing
3) erode
Step-by-step explanation:
The paint on the old barn was weathered by the sun, meaning it had gotten changed by it
The ocean's waves were depositing more seaweed, meaning that the waves were leaving behind seaweed on the shore
The rain will erode the hillside, meaning that the rain will wear away the soil, making the hill smaller.
I hope this helps you!