The energy in biomass comes from the ...
sun.
In a hydropower plant water spins a ... to make electricity.
turbine
The Earth has three layers, the ..., the mantle and the crust.
core
When water turns into vaporm this is called...
evaporation.
Solar power is ... energy.
light
Sola energy makes plants...
grow
... makes the water move.
Gravity
Solar energy travels to the Earth in ...
rays.
When gas turns into a liquid, this is called...
condensation.
Biomass is wood, plants and ...
garbage.
We can build a ... across a river to control the flow of water.
dam
Wind is moving...
air.
Geothermal energy is ... inside the Earth.
heat
Solar cells turn sunlight into...
electricity.