Matching Pairs Interm 12-Unit 5: Survival Online version Activity 2 by MD1 UTDA 1 When there is an... 2 When mud, rock and stones slide down a hill... 3 A Hurricane is a... 4 When an earthquake happens... 5 An eruption occurs when... avalanche, a lot of snow slides down a mountain. is called a landslide. a volcano makes an explosion of rock, gas and dust. the ground shakes and moves. large storm that begins over the northern Atlantic Ocean.