Wind and amplitude creates the waves in an ordinary ocean
Answer:
Plants slow down water as it flows over the land and this allows much of the rain to soak into the ground. Plant roots hold the soil in position and prevent it from being blown or washed away. Plants break the impact of a raindrop before it hits the soil, reducing the soil's ability to erode.
Explanation:
Average speed = distance / time
Average speed = 90 km / 0.5 hrs
Average speed = 180 km per hour
6.3 That Would be the I answer I think but Check on Google For the formula