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Environmental hazards,causes of floods

Answer Text:
Environmental Hazards.
-Dangers or disasters within the environment due to natural causes or human activities.
They include :
1.Floods
2.Lightining
3.Windstorms
4.Drought
5.Fines
6.Volcanic eruption
7.Pests and diseases
8.Pollution
9.Earthquakes
1) Floods
-An overflow of a large amount of water over dry land.
Causes
-Spilling of excess water of a river over its banks into the surrounding areas.
Rising of the level of the sea or lake due to increased rainfall.
-Exceptionally heavy rainfall like El Nino resulting in excess water on land collecting in shallow basins and flat areas causing flooding.
-Breaking of a dam making the water in the reservoir to drown the land on the downstream side of the valley.
-When an earthquake occurs in the ocean causing huge sea waves called Tsunami which travels to the land flooding it.