reflect, When sunlight hits the surface of a calm lake, some of the light bounces back towards the sky while the rest passes into the water. In other words, the lake can ______ the sunlight., scatter, When a beam of light passes through tiny particles in the atmosphere, the particles send the light off in different directions. This is why the light can ______ rather than travel in one straight line., dissolved, If you add a spoonful of sugar to hot tea and stir it for a few seconds, the crystals disappear completely into the liquid. The sugar has ______., rotate, The Earth is constantly turning around an imaginary line through its centre. It takes roughly 24 hours to ______ once on its axis., struggled to, The little plant had been growing in a dark corner of the room for weeks. Its leaves were pale and weak because it ______ ______ get enough sunlight., seaweed, When we walked along the beach, we noticed long green and brown plants washed up on the sand. They weren't ordinary grass — they were pieces of ______ brought in by the waves., sunray, The curtains were almost completely closed, but one tiny gap allowed a narrow beam of sunlight to enter the dark bedroom. A single ______ lit up the dust floating in the air., leap year, My birthday is on February 29, so I don't get an actual birthday date every year. I can celebrate it on the calendar only when it is a ______ ______., blink, The optician asked me to stare at a small light while she examined my eyes. She said, “Try not to ______ for a few seconds.”, moist, After baking the cake, I cut into the centre and found that it was soft and slightly wet rather than dry and crumbly. The inside was still ______., liquid, The pharmacist gave me two versions of the medicine: one in tablets and another that you could measure with a spoon and swallow. The second version was a ______., droplet, After I took the cold bottle out of the fridge, tiny beads of water began appearing on the outside. Each individual ______ was so small that I could barely see it., moisture, The bathroom mirror becomes covered with tiny drops after a hot shower because warm air contains more water. This extra ______ eventually settles on the cooler glass., particle, Smoke may look like one continuous cloud, but it is actually made up of countless extremely tiny pieces of material floating through the air. Each tiny piece is a ______., water vapour, When you boil a kettle, water changes from a liquid into an invisible gas. This gas mixes with the air around it and is known as ______ ______., gravity, If you throw a ball into the air, it doesn't continue rising forever. It slows down, stops for a moment, and then falls back towards the ground because of ______., is made up of, A rainbow may look like one smooth band of colour, but when scientists analyse it, they find that it ______ ______ ______ many different wavelengths of visible light., spread out, I put a drop of food colouring into a glass of water and left it untouched. At first the colour stayed in one small area, but eventually it began to ______ ______ through the whole glass., rainbow, It had been raining heavily while the sun was still shining, and when the clouds finally moved away, we could see a beautiful arc of red, orange, yellow, green, blue and violet across the sky — a ______., wavelength, Radio stations use different frequencies so that their signals don't interfere with one another. One important property of a wave is its ______, which is the distance between corresponding points on successive waves., molecule, A single drop of water contains an enormous number of tiny units. Each unit consists of two hydrogen atoms joined to one oxygen atom, forming one water ______., divide it into, When teachers explain the electromagnetic spectrum, they usually separate it into several categories, such as radio waves, microwaves, infrared, visible light and ultraviolet. They ______ ______ ______ different regions., adjustment, The first photo was too dark, so I changed the camera settings slightly and took another one. That small ______ made the image much clearer., eyelid, When something suddenly flies towards your face, you automatically close the thin piece of skin covering your eye. This protective movement happens because your ______ closes., fluid, Unlike a solid object such as a stone, this substance can flow and take the shape of whatever container it is placed in. Water is a familiar example of a ______., keep your eyes safe, You should wear proper sunglasses on a very bright day because prolonged exposure to ultraviolet radiation can damage your eyes. Good sunglasses help ______ ______ ______ ______., cornea, When you look at someone's eye, the transparent curved layer at the very front is the part that first receives incoming light. This outer layer is called the ______., the science behind, The special coating on these glasses seems almost magical because it reduces glare while still allowing you to see clearly. But there is actually a lot of ______ ______ ______ this technology., matter, Ice, water and steam look completely different, but they are all forms of the same physical substance. They are different states of ______.

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