List of Words for Letter ‘S’
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scientific method An organized process that scientists use to answer questions.
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sedimentary rock A rock that forms when small bits of matter are pressed together in layers.
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seed An undeveloped plant with stored food sealed in a protective covering.
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seismic wave A vibration caused by an earthquake.
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seismograph An instrument that detects and records earthquakes. It shows seismic waves as curvy lines along a graph.
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series circuit A circuit in which electric current flows in the same direction along a single path.
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simple machine Anything that has few parts and makes it easier to do a task.
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skeletal system The organ system made up of bones that support the body.
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soil profile A view of the different horizons in a soil sample, from the surface down to the bedrock.
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soil water Water that soaks into and collects in soil.
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solar eclipse A blocking of the Sun’s light that happens when Earth passes through the Moon’s shadow. At that time the Moon is between Earth and the Sun.
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solar system The Sun and all the objects that orbit around it.
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solid A state of matter that has a definite shape and volume.
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solution A mixture in which one or more kinds of matter are mixed evenly in another kind of matter.
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sound wave An area of bunched-up and spread-out particles that move outward in all directions from a vibration.
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speed The distance traveled in an amount of time.
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sponge A simple invertebrate that has a hollow body with a single opening and lives in water.
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spore A cell in a seedless plant that can grow into a new plant.
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star A hot sphere of gases in space that makes its own light.
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static electricity The buildup of electrical charge on an object or material.
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stationary front A boundary between air masses that are not moving.
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stem The part of a plant that holds the plant up and carries food, water, and other materials to and from the roots and leaves.
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stimulus SSomething in the environment that causes a living thing to react.
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stomata Pores in the bottom of leaves that open and close to let in air or give off water vapor.
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subsoil A hard layer of clay and minerals beneath topsoil.