1. When rainbows appear, they are always in the part of the sky / opposite directly the Sun.

2. Luminescence refers to the emission of light by means /another than heat.

3. George Washington Carver found hundred of uses for the peanut, the sweet potato, and the soybean and thus stimulated the cultivations of these crops.

4. A rocket burns propellant rapidly and most rockets carry a supply that last just a few seconds.

5. The scientific revolution of the early 1900's affected education by change the nature of technology.