Tsunamis are

waves that are produced by tidal forces

waves that cannot cause damage on land

often generated by movements of the ocean floor

also known as tidal waves

often generated by movements of the ocean floor

Explanation:

The tsunamis are the most devastating waves that occur on our planet. They are enormous and have great power, and once they reach the coastline they continue into the land and destroy pretty much everything on their way. These waves are mostly generated by movements, disturbances on the ocean floor. They occur at places where there's subduction zones. When an adjustment occurs between the crust of the plates, it creates an earthquake. That adjustment of the crust also creates gaps, through which the water is sucked in, and than as the crust continues with the adjusting and shuts the gap, the water is pushed back with lot of force. That creates the tsunamis, enormous, high speed, very powerful waves, that are devastating for everything on their way.

coal is not sustainable because it will one day run out.

c. movement because i took the test and it lets me review my answers