What causes it?

It is caused by earthquakes, and volcanic eruptions.

What conditions in the environment are right for it?

They only occur on water or over water.

What type of damage can it cause?

They kill people, and destroy things.

What are some notable ones?

Place/date/effect

The Indian Ocean Earthquake caused the Indian Ocean Tsunami on December, 26, 2004.

What can occur in the aftermath of it?

Very few will survive, and families mourn losses.

Are they predictable?

What tools are used?

They are predictable by feeling an earthquake or seeing abnormal waves in the Ocean.