What is a geothermal heat pump? A geothermal heat pump is a way of heating and cooling buildings by exchanging their heat with the ground. Natural objects obviously gain and lose heat depending on the amount of sunlight, what they are made of, the weather, where they are, and a whole host of other conditions. […]
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What is the difference between disc brakes and drum brakes? The main difference between disc brakes and drum brakes is their size and their position on the wheel. They both have advantages and disadvantages. All cars obviously have brakes, and they work on a hydraulic system. The brake lines are filled with a brake fluid
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How does an icebreaker ship work? Icebreaker ships work by driving their bow up onto the ice and then using their weight to crush the ice. They don’t just smash straight through it. Icebreakers are not regular ships. They need several special features. They need a strengthened hull, they need to have a unique shape,
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How does an X-ray machine make an image？ An X-ray makes an image because some parts of the body absorb X-ray radiation and some parts of the body don’t. Bones absorb the majority of it and appear white. X-rays are a type of electromagnetic radiation with a wavelength between 10 nanometers and 10 picometers. There
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What is a lava tube? A lava tube is a tunnel made by flowing lava that sets on the outside but continues to flow on the inside. They can range from very small to enormous. For lava tubes to form, you obviously need lava. Not all volcanic eruptions produce lava. Some of the bigger, more
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What is a sinkhole? A sinkhole is a place where the ground has collapsed to leave a hole, caused by material below the ground being removed. Sinkholes can range from just a few meters deep to enormously deep, and they can be caused naturally or by human activity. The largest sinkhole in the world is
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How does a speed camera work? Older types of speed cameras work out the time it takes for a car to travel between two known points. Modern speed cameras look at the wave length of radio waves or how long it takes light to return to the sensor. The old type of speed camera are
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Why does water need to be softened? Water needs to be softened to remove minerals, such as calcium and magnesium, which build up and clog taps and water supply systems. Depending on where you live, you may or may not need a water softener. This is because of the geology and the rocks that the
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Why do ships have a bulbous bow? Many ships have a bulbous bow to create a wave that helps reduce drag, which increases fuel efficiency. Any object that is moving, unless it is in a vacuum, is subject to forces that act upon it. These can be friction with the ground or surface, and wind
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What is a kelp forest? A kelp forest is a dense area of kelp in the sea. Kelp is a type of algae. They form incredibly diverse ecosystems, and they can help to clean up the sea. Kelp are giant strands of brown algae, probably more commonly known as seaweed. They look like plants, but
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