Why does pumice float? Pumice floats because it has a very low density. This is because of all the gas-filled holes inside it. Whether or not something floats depends on how much water it can displace. Objects float in water if they are positively buoyant, which means they can displace more water than their own […]
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How does ivy grip walls? Ivy grips walls by using special roots that grow out from its stems. These are called aerial roots or adventitious roots, and they work like tiny natural anchors. There are many different types of plants that grow up walls, but ivy is probably one of the most well-known. Ivy climbs
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How do animals migrate up and down mountains? A lot of animals do migrate up and down mountains. This is called altitudinal migration. It is a kind of vertical migration, although the term vertical migration is also used for animals that move up and down through the ocean every day. Animals migrate over many different
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How do warning colors on animals work? Warning colors on animals work by being easy to see, easy to remember, and unpleasant enough that predators learn not to make the same mistake twice. Many animals are either trying to hide from predators or trying to creep up on prey. That is why so many animals
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Why are there so many different types of electrical outlets? There are so many different types of electrical outlets because countries built their electrical networks independently, and they all made different choices based on their own technology, traditions, safety rules, and requirements. There are 15 commonly listed styles of electrical plug and outlet around the
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How did people first learn how to smelt metal? They probably learned through a gradual process of experimentation, observation, and learning from the results. Copper was the first metal to be smelted on a large scale, at least by around 5000 BC. The discovery of smelting is probably one of the most important discoveries of
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Why do people have different accents? People have different accents because speech is shaped by geography, group identity, social class, peer influence, migration, and history. An accent is not just a way of pronouncing words. It is also a sign of where someone comes from, who they grew up with, and sometimes who they want
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Why does starch thicken sauce? Starch thickens sauces because starch granules swell when they are heated in water. As they swell, they trap water and release long starch molecules that tangle together, turning a thin liquid into a thicker one. Starch is a complex carbohydrate that is produced by green plants as their main way
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How do insects survive the winter? A lot of insects don’t survive the winter, and they haven’t evolved to. They are born, live long enough to reproduce, lay eggs, and die. However, that does not mean the species dies out. Many insects survive winter as eggs, larvae, nymphs, or pupae. Other insects live through the
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How can some animals be transparent? Animals can be transparent if their bodies let light pass through them without absorbing, reflecting, or scattering too much of it. There are not many transparent animals, and most of them are found in water. Some of them are partially transparent and some are almost completely transparent. Even animals
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