1. Transportation/Systems
Natural Disasters/Basic Needs Unit

2. BRIDGE
a structure built over something (such as a river) so that people or vehicles can get across.

3. Dam
a structure that is built across a river or stream to stop water from flowing.

4. TUNNEL
a passage that goes under the ground or through a hill.

5. 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.

6. Irrigation system
a system used to supply water to land without water by using pipes or ditches.

7. LANDFILL
a system in which waste materials are buried under the ground.