Which characteristic of tsunamis is true? They are measured by how far they travel.

They cause the ocean to briefly drain away from the shore.

They can travel as fast as 500 miles per day.

They occur a day or two after an earthquake.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

the answer is b. apsidal precession

answer at the divergent plate boundary in the middle of the ocean;