Related Topics:1. Energy is a physical quantity that follows precise natural laws.2. Physical processes on Earth are the result of energy flow through the Earth system.
Associated Grade Levels:1-23-45-67-89-1011-12
1.1 Energy is a quantity that is transferred from system to system.
2.2 Sunlight, gravitational potential, decay of radioactive isotopes, and rotation of the Earth
2.1 Earth constantly changes as energy flows through the system.