Yahya STAL - Natural DisastersOnline version Test your knowledge about natural disasters! by Yahya Word Wide Web 1 Avalanches are caused by the rapid movement of snow down a slope. Yes No 2 Tornadoes can form from severe thunderstorms. Yes No 3 Natural disasters are caused by human activity. Yes No 4 Avalanches only happen in mountainous regions. Yes No 5 Earthquakes can be predicted with great accuracy. Yes No