Please answer the following question: Given the following passage  "Glaciers end in ice caves (the Rhone Glacier), by trailing into a lake or river, or by shedding snowmelt on a meadow. Sometimes a piece of glacier will detach or break resulting in flooding, property damage and loss of life. In the 17th century about 2500 people were killed by an avalanche in a village on the French-Italian border; in the 19th century 120 homes in a village near Zermatt were destroyed by an avalanche.",  answer the following question. Note that the answer is present within the text.  Question: Glaciers can cause what movement of geographical material?
A:
avalanche