Related Topics:4. Various sources of energy are used to power human activities. 8. Wood based bio-fuels are one form of energy that is renewable
Associated Grade Levels:1-23-45-67-89-1011-12
4.3 Fossil and biofuels are organic matter that contain energy captured from sunlight.
8.1 Sources of cellulosic residuals used are found in forest operations and in industry process