Related Topics:4. Various sources of energy are used to power human activities.
Associated Grade Levels:7-89-1011-12
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
4.2 Humans use of energy is subject to limits and constraints.
4.7 Different sources of energy and different ways energy is transformed, transported, and stored.