I'm sure you have turned in your assignment by now, but for future viewers:
1. Biomass: Organic waste
2. Geothermal: Heat from the earth
3. Hydroelectric: Movement of water
4. Solar: sun
5. Wind: movement of air
Explanation:
Bio implies living organisms while mass means quantity
A large quantity of living organisms creates a lot of waste which is organic.
Geo: land, terrain. Thermal: temperature.
Hydroelectric: Hydro is water and electricity allows us to move it.
Solar: The word solar is related to the sun and the heat or light from it
Wind: This doesn't need explanation
