| A | B |
|---|
| water | natural resource |
| solar energy | renewable resource that supports life |
| humus | decayed plant and animal matter in soil |
| soil | covers most the Earth's land surface |
| subsoil | layer made mostly of small rocks |
| nonrenewal resource | takes a long time to replace |
| petroleum | nonrenewable resource being used to fast |
| coal | energy in it can be traced back to the sun |
| wind mill | captures the wind's energy |
| global warming | releasing carbon dioxide in air from nonrenewable resources |
| recycling | paper is easiest material to recycle |
| solar cells | changes solar energy into elecrticity |
