Final answer:
Tsunami are typically about 1 cm high in the open ocean, and 6-15 m high on reaching shallow water. option b is answer
Step-by-step explanation:
Tsunamis are typically about 1 meter high in the open ocean (B), and can rise to 6-15 meters high upon reaching shallow water. When a tsunami is in deep water, its height is usually inconspicuous, often less than 30 centimeters.
However, as it approaches the coast, where the water shallows, the wave slows down and grows substantially in height, which can be as much as 30 meters, particularly if the sea floor geography amplifies the wave's height.
Check Your Learning: If a tsunami travels at the speed of 600 km/h and approaches a shore at a rate of one wave crest every 15 minutes, the distance between wave crests at sea would be 150 kilometers. This calculation is based on the wave speed (600 km/h) and the frequency of the waves (4 waves per hour). option b is answer