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
4.3 Fossil and biofuels are organic matter that contain energy captured from sunlight.
4.1 Humans transfer and transform energy from the environment into forms useful for human endeavors
3.1 The Sun is the major source of energy for organisms and the ecosystems of which they are a part