Return to Book List   Glossary   Choose a Letter | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |   List of words for Letter 'S' Click on    to hear the word and definition. Click on the picture to see a bigger picture. Some are animations. season a time of the year  Spring is the season after winter. seed the part of a plant that can grow into new plants  These seeds look different. seedling a young plant  This is a bean seedling. senses what you use to find out about the world around you  The girls use the sense of touch. shelter a place where animals can live and be safe  This animal uses a tree for shelter. simple machine something that changes the direction or size of force to make work easier  Hand trucks and ramps are simple machines. sink to fall to the bottom  Some solids sink in water. skeleton a full set of bones  A dinosaur skeleton helps scientists learn about what dinosaurs looked like. soil Soil has tiny bits of rock and dead plants and animals in it.  Soil has living and nonliving things in it. solar system the Sun, nine planets, and all of their moons  The Sun is the center of our solar system. Leave Glossary