| A | B |
| Kinetic energy | the energy of motion |
| Momentum = | mass X velocity |
| Momentum is a | vector quantity |
| The Kinetic Molecular Theory | explains the forces between molecules |
| Kaolin | a white clay used in ceramics |
| Karst | an irregular limestone landscape |
| Karyotype is the | chromosonal characteristics of a cell |
| Katydid | large green-horned grasshopper |
| Keratin | fibrous protein |
| Keratitis | inflammation of the cornea |
| Kernite | a source of borax |