Across
- 4. - a part of Earth that is very wide, has a taller height than a hill and often has steep sides, or it is a large pile of something.
- 5. - the basis of the fluids of living organisms.
- 7. - a state of matter that has no fixed shape and no fixed volume.
- 8. - are an energy source that cannot be depleted and can supply a continuous source of clean energy.
- 14. - knowledge put into practical use to solve problems or invent useful tools
- 15. - a measure of the average kinetic energy of the particles in an object.
- 16. - the star around which the earth orbits
- 17. - the solid mineral material forming part of the surface of the earth and other similar planets.
- 19. - able to be maintained at a certain rate or level
- 20. - move from one place to another.
Down
- 1. - a form of energy that can be transferred from one object to another
- 2. - the preserved remains, or traces of remains, of ancient organisms
- 3. - an installation where electrical power is generated for distribution.
- 6. - a source of supply or support
- 9. - a form of energy resulting from the existence of charged particles
- 10. - defined as the ability to do work
- 11. - relating to the earth.
- 12. - material such as coal, gas, or oil that is burned to produce heat or power.
- 13. - the vapor into which water is converted when heated
- 18. Energy - is a heat within the earth