Tsunami are waves created by underwater __________. They occur when a build up of pressure between __________ plates results in a sudden movement as something gives.
Scientists find it difficult to __________ the exact time earthquakes and tsunami waves will occur, because they can originate in remote places such as the middle of an ocean, where it can be difficult to collect __________.
Even if the measurements can be made it is hard to measure the strain between plates. When there is a build up of strain, it may __________ in a number of smaller quakes or result in a large one.
The best that can be done at the moment is to look at the __________ time between quakes and apply that to the future.