They have been known to produce extremely high dangerous winds, torrential rains and flooding. Tornados are violent funnel shaped clouds of destruction. They develop through changing wind directions and increasing wind speeds of thunderstorms. This causes a spinning effect within the air and forms the funnel shape. It usually stretches from the thunderstorm cloud to the ground.
Flooding occurs from excessive rainfall.
Water does not have enough time to drain and so it backs up. Flooding also in turn can cause more destruction by knocking things over, starting fires among other ways. Volcanoes are formed from earthquakes. The earth has tetonic plates which are constantly moving. Earthquakes arise from these plates spreading apart, colliding with other plates, or sliding past other plates.