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crossword puzzle

Across
a fence or other obstacle that prevents movement or access
(of a surface or body) throw back (heat, light, or sound) without absorbing it
a stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
the strength and vitality required for sustained physical or mental activity
passed on from one person or place to another.
(of water, air, or glass) make (a ray of light) change direction when it enters at an angle.
working or produced by machines or machinery.
surfaces, or objects) side by side and having the same distance continuously between them
a roughly circular line, route, or movement that starts and finishes at the same place
a substance which does not readily allow the passage of heat or sound.
a container consisting of one or more cells, in which chemical energy is converted into electricity and used as a source of power.
Down
minute portion of matter
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
a material or device that conducts or transmits heat, electricity, or sound, especially when regarded in terms of its capacity to do this
operating by or producing electricity
relating to or resulting from motion.
the amount of power supplied by a source; the resistance of moving parts to be overcome by a motor.
having or showing the capacity to become or develop into something in the future
relating to heat
(of energy or a liquid or other substance) taken in or soaked up