Facts

All Living Materials Forces Earth Space Body Unusual

Measured factPlants make foodPlants make their food from sunlight, air, and water.
Measured factPlants give off oxygenIn sunlight, plants give off oxygen.
Measured factBees carry pollenBees carry pollen from flower to flower.
Measured factSeeds need waterMany seeds start to grow when they get water and warmth.
Measured factMushrooms are fungiA mushroom is a fungus, not a plant.
Measured factWhales breathe airWhales are mammals, so they breathe air.
Measured factA cactus stores waterA cactus stores water in its stem.
Measured factLight bird bonesMany bird bones are hollow, which helps birds stay light.
Measured factCoral is animalsCoral reefs are built by tiny animals.
Measured factChimps use toolsSome chimpanzees use sticks as tools.
Measured factDNA is a ladderDNA is a long twisted ladder that holds instructions for a living thing.
A theoryLiving things changeLiving things change over a very long time.
Measured factWater is H2OWater is H2O, two hydrogen atoms and one oxygen atom.
Measured factThree statesMatter can be a solid, a liquid, or a gas.
Measured factIce floatsIce floats on liquid water.
Measured factWater boilsAt sea level, water boils at 100 degrees Celsius.
Measured factSalt dissolvesSalt can dissolve in water and seem to vanish.
Measured factIron rustsIron rusts when it meets both water and air.
Measured factGlass from sandPeople make glass by heating sand with a few other minerals until it melts.
Measured factCarbon two waysDiamond and pencil graphite are both carbon, packed in different ways.
Measured factOil floatsOil floats on water because it is less dense.
Measured factPlastic chainsMost plastic is made of long chains of molecules, and a lot of it starts as oil.
Measured factGold does not rustGold does not rust the way iron does.
Measured factThe element tableThe periodic table lines the elements up by patterns in their atoms.
Measured factA force is a pushA force is a push or a pull.
Measured factTwo polesA magnet has two poles, called north and south.
Measured factMagnets pull ironA magnet pulls iron, but it does not pull wood, plastic, or copper.
Measured factPoles push or pullOpposite poles pull together, and the same poles push apart.
A theoryThings fallDropped things fall toward Earth, and a theory of gravity explains that pull.
Measured factSound needs stuffSound needs something to travel through, so it cannot cross empty space.
Measured factLight crosses spaceLight can travel through empty space.
Measured factFriction slows slidesFriction is a force that slows things that rub or slide.
Measured factA lever helps liftA lever can help you lift a heavy load with a smaller push.
Measured factStill stays stillA still object stays still until a force moves it.
Measured factHot air risesHot air rises above cooler air.
Measured factEarth goes around the SunThe Earth goes around the Sun.
Measured factA year is one tripA year is one trip of Earth around the Sun.
Measured factA day is a spinA day is about one full spin of Earth.
Measured factWhy seasons happenSeasons happen because Earth is tilted as it goes around the Sun.
Measured factEarth has layersEarth has a crust, a mantle, and a core.
Measured factFossils in rockFossils are remains or traces of living things kept in rock.
Measured factOcean covers mostOcean covers most of Earth.
Measured factVolcanoesA volcano can let melted rock come out of Earth.
Measured factEarthquakesAn earthquake happens when rock under our feet slips.
Measured factWhat soil isSoil is broken rock mixed with air, water, and bits of living things.
Measured factThe Moon and tidesThe Moon's pull helps make ocean tides.
Measured factWeather and climateWeather is what the air does today, and climate is the pattern over many years.
Measured factThe Sun is a starThe Sun is a star.
Measured factEight planetsEight planets go around the Sun.
Measured factThe Moon reflectsThe Moon does not make its own light. It reflects the Sun.
Measured factMoon phasesThe Moon looks different each night because we see different amounts of its sunny side.
Measured factSaturn's ringsSaturn's rings are made mostly of chunks of ice and rock.
Measured factThe Milky WayOur galaxy is called the Milky Way.
Measured factRockets push gasA rocket moves forward by pushing gas backward.
Measured factFloating in orbitPeople in orbit float because they are falling around Earth, not because gravity is gone.
Measured factTelescopes gather lightA telescope gathers light so faint things look brighter.
A theorySpace may stretchMany far galaxies look redder, and a theory says space itself is stretching.
A guessLife beyond EarthThe idea that living things exist beyond Earth is a guess until a test shows them.
Measured factYour heart pumpsYour heart pumps blood around your body.
Measured factLungs and oxygenYour lungs take in air so your blood can carry oxygen.
Measured fact206 bonesA grown person's skeleton has 206 bones.
Measured factMuscles pullMuscles pull on bones. They do not push.
Measured factGerms and handsSome germs can cause illness, and washing hands with soap helps stop their spread.
Measured factFive sensesYou can see, hear, smell, taste, and touch.
Measured factHard tooth coatTeeth have a hard coat called enamel.
Measured factYour brainYour brain helps you think, feel, and move.
Measured factSkin is biggestSkin is your body's biggest organ.
Measured factSleep helpsSleep helps you remember and gives your body time to grow.
Measured factStomach acidYour stomach makes a strong acid that helps break down food.
Measured factSome germs helpSome germs help us, like the ones that turn milk into yogurt.
Measured factLiquid metalA metal can be a liquid at room temperature, and that metal is mercury.
Measured factA frog can freezeSome wood frogs can freeze in winter, then thaw and hop.
Measured factThree heartsAn octopus has three hearts.
Measured factA banana is a berryA banana is a berry, and a strawberry is not.
Measured factTaste with feetButterflies taste with their feet.
Measured factCube droppingsA wombat's droppings are cube shaped.
Measured factSharks before treesSharks were swimming before the first trees grew.
Measured factA tower growsThe Eiffel Tower stands a little taller on a hot day.
Measured factA new tailSome lizards can drop a tail and grow a new one.
Measured factA long Venus dayOne full spin of Venus takes longer than its trip around the Sun.