Related Topics:3. Biological processes depend on energy flow through the Earth system.4. Various sources of energy are used to power human activities.
Associated Grade Levels:3-45-67-8
National Defense Education Program Video on BiofuelsAssociated Grade Levels:3-45-67-8
3.1 The Sun is the major source of energy for organisms and the ecosystems of which they are a part
4.1 Humans transfer and transform energy from the environment into forms useful for human endeavors
4.3 Fossil and biofuels are organic matter that contain energy captured from sunlight.