Why do waterfalls move upstream? Waterfalls gradually move upstream because they erode the rock beneath them. You might think a waterfall will always stay where it is, but waterfalls can gradually move upstream, sometimes to the point where they disappear forever. Take Niagara Falls, for example. Niagara Falls is probably the most famous waterfall in […]
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What is the watershed? A watershed is a turning point or a dividing point between two times or events, although the word originally comes from geography. In geography, a watershed is an area of land that drains water to a specific point. Another word for a watershed is a drainage basin. It is basically the
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Why are some places windier than others? There are many reasons why some places might be windier than others. Some of those reasons are temperature differences, topography, the amount of surface friction, and wind funneling. Wind is caused when air moves from an area of high pressure to an area of low pressure. Air behaves
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Why does China only have one time zone? China only has one official time zone because that is what Chairman Mao decreed in 1949 to promote unity in the newly formed People’s Republic of China. The world is divided into time zones because of the speed at which the Earth rotates and the amount of
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Do we still need weather balloons? Yes, weather balloons are still needed. Satellites can provide a lot of data, but they still cannot sample the atmosphere directly from inside it, and they are far more expensive. There are thousands of satellites in orbit around Earth at the moment, so it is easy to assume there
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Who were Currer, Ellis, and Acton Bell? They were the pseudonyms used by Charlotte, Emily, and Anne Brontë. The Brontë sisters are known for some of the most famous novels in the English language. Charlotte Brontë wrote four novels, the most famous of which is Jane Eyre. Emily Brontë wrote Wuthering Heights. Anne Brontë wrote
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How do salt flats form? Salt flats form when water with a high mineral content gets trapped and evaporates more quickly than it can be replenished. Salt flats are sometimes called salt pans. They are a large expanse of land that used to be a lakebed but is now covered in a hard crust of
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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 did they find the Chicxulub crater? They found the Chicxulub crater, the remains of the asteroid that wiped out the dinosaurs, when they were looking for oil. The Chicxulub crater was made when an asteroid ten kilometers in diameter hit Earth. It landed just over 66 million years ago and left a crater that
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