| A | B |
| solid | The state of matter that cannot change shape or volume. |
| solution | A mixture in which two substances seem to disappear into each other. |
| smooth endoplasma reticulum | The transportation system within a cell that does not contain ribosomes. |
| solar eclipse | When the moon is between the earth and the sun. |
| stars | Glowing balls of hot gas. |
| static charges | Charges that stay in one place. |
| survival of the fittest | The animal that is best adapted to the ecosytem has the best chance of survival. |
| suspension | A mixture in which solid particles are suspended in a liquid. |
| symbiosis | A relationship between organisms of different species. |
| taxonomy | A naming system used to classify living things. |
| technology | The use of tools to solve problems. |
| telophase | The stage in mitosis where the cytoplasm divides. |
| temperature | The measure of how hot or cold something is. |
| tides | The gravitational pull of the moon on large bodies of water. |
| transpiration | The movement of water from a plant to the clouds. |
| tRNA | This RNA brings amino acids to be translated to mRNA/rRNA. |
| unsaturated zone | The area above the water table that does not hold water. |
| vacuole | This structure stores food and water in cells. |
| velocity | The rate of speed an object has. |
| viscocity | The thickness of a liquid. |
| water cycle | The movement of water as it goes from one state of matter to another. |
| water pollution | The contamination of our water supply with chemicals, wastes or other materials. |
| weight | The force of gravity on an object at the surface of a planet. |
| wetlands | Ecosystems that are sometimes wet during the year and at times dry. |
| unbalanced force | A force that is not balanced and shows movement. |