1.   As it encounters a shallow bottom near land, tsunamis slow and energy can be converted into very tall waves.

2.   As it encounters a shallow bottom near land, tsunamis slow and energy is converted into high waves.

3.   As it encounters a shallow bottom the energy can be converted into monstrously high waves.

4.   Here, because of the shallow bottom, water piles up and sea levels rise rapidly.

5.   Slowly, the gray hulking shadows rose from the shallow bottom to grab a breath of air and just as slowly sank back down.