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3. parts of a fluid or an elastic solid whose equilibrium has been disturbed
6. produced by continuous and regular vibrations, as opposed to noise.
9. the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
10. not having or showing thought or spontaneity; automatic.
13. sending out light; shining or glowing brightly.
14. the natural agent that stimulates sight and makes things visible.
16. relating to chemistry, or the interactions of substances as studied in chemistry.
19. operating by or producing electricity.
20. The measure of how much something weighs.

1. the resistance that one surface or object encounters when moving over another.
2. work or energy, equal to the work done by a force of one newton when its point of application moves one meter in the direction of action of the force
4. relating to the nucleus of an atom.
5. the star around which the earth orbits.
7. relating to heat.
8. Panels a panel designed to absorb the sun's rays as a source of energy for generating electricity or heating.
11. energy the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
12. Energy energy which a body possesses by virtue of being in motion.
15. the measurement from base to top or from head to foot.
17. the strength and vitality required for sustained physical or mental activity.
18. the basic unit of a chemical element.