Energy

4. The 'one way' sign for electrical circuits
5. A large body of mass with no definite shape
7. Materials that do not allow electricity to pass through them
8. of Conservation, States that energy can neither be created nor be destroyed
10. Current, The flow of charged particles such as electrons or ions, moving through an electrical conductor or space
11. Energy, The energy of motion
14. Not moving or not intended to be moved
15. The standard unit of measurement that describes an amount of energy or work that occurs in a movement of force
17. Study of the loss of Earth's biological diversity and the ways this loss can be prevented
19. The process of transferring heat through air or liquid currents
20. The action or process of moving or being moved
21. Energy that moves from one place to another in a form that can be described as waves or particles

1. The study of the relationships between living organisms, including humans, and their physical environment
2. Energy, The stored energy in an object due to its position, properties and forces acting on it
3. Is a measure of the opposition to current flow in an electrical circuit
6. Design, Those that require no external energy source to be effective
9. Force that resists the sliding or rolling of one solid object over another
12. The transfer of energy, such as heat or an electric charge, through a substance
13. The rate at which electrons flow past a point in a complete electrical current
16. A substance or material that allows electricity to flow through it
18. A marked change in form, nature or appearance of