Question

these lights are too cool!
physical science studies: wave interactions
cities around the country have been using some new traffic lights. these lights last longer and use less energy. so cities save money. but the bulbs dont burn hot enough to melt snow. this can cause problems for drivers.
the traffic lights use led bulbs. these bulbs use much less energy than those used in most traffic lights. thats good for the environment. its also good for cities. since the bulbs use less energy, they last for seven or more years. other bulbs need to be changed every 12 to 18 months.
what else is good about led traffic lights? they dont waste energy by making heat. this is also a problem, however. why? the lights dont melt snow. wet snow can
the news story says:
some cities are trying to find ways to block the snow. others hope to heat the traffic lights so the snow will melt.
which must mean the opposite of melt?
a. scatter
b. tumble
c. freeze
d. stretch

Explanation:

The word "melt" means to change from a solid to a liquid state, usually due to heat. The opposite of this would be to change from a liquid to a solid state, which is what "freeze" means. "Scatter" means to spread out, "tumble" means to roll or fall, and "stretch" means to extend. None of these are the opposite of "melt".

Answer:

C. Freeze