Transportation/Systems Natural Disasters/Basic Needs Unit
BRIDGE a structure built over something (such as a river) so that people or vehicles can get across.
Dam a structure that is built across a river or stream to stop water from flowing.
TUNNEL a passage that goes under the ground or through a hill.
canal a long narrow place that is filled with water and was created by people so that boats could pass through it or to supply fields or crops with water.
Irrigation system a system used to supply water to land without water by using pipes or ditches.
LANDFILL a system in which waste materials are buried under the ground.