plant roots breaking apart a rock
slow
landslide
fast
tsunami hitting a beach
fast
water hitting the side of a sea stack
slow
flash flood
fast
a canyon being formed by a river
slow
earthquake
fast
water carrying away the bank of a river
slow
glacier moving down a mountain
slow
volcano erupting
fast
wildfire
fast
water dripping to form a cave
slow
wind carrying away pieces of sediment
slow