This happens when a mass of rock, debris and earth moving down a slope
a landslide
What is the name of extremely high waves that forms during natural disasters?
a tsunami
What do you call a situation where it rains too much and water covers the land?
a flood
what do you call a storm with violent wind that forms on water?
a hurricane
What do you call the falling of a mass of snow?
an avalanche
what is this?
a fissure