How have sea levels changed over time? Over the last 542 million years they have varied from 130 m lower than their level today to a theoretical 300 m higher than they are today. It is theoretical because the continents move around a lot, and it is difficult to find evidence for where the seas […]
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Do other planets have tectonic plates? In our Solar System, Earth is the only planet with tectonic plates, but in other solar systems there will probably be planets the same as ours. Out of all the planets in the Solar System, Earth is the only one with tectonic plates. Neptune, Uranus, Saturn, and Jupiter are
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What is a jungle? It is generally an area of dense forest in a tropical climate. Many people think a rainforest is a jungle but they are different because a rainforest is a specific ecosystem, and a jungle is a description of an overgrown and tangled forest. The word “jungle” has come into English from
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What causes a heat wave? It is caused when high-pressure air traps a layer of heat near the surface of the Earth and raises the temperature. A heat wave is called when the average temperature for that time of year is higher than the historical average for more than two days in a row. Recently,
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Why are some beaches rocky and some sandy? It is because of the energy of the sea, the source of the particles, the shape of the shoreline, local weather, and the angle of the seabed, amongst other things. There is no agreement on how much coastline there is in the world. There are estimates of
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Why is sea level where it is? Because the volume of water in the oceans fills all of the valleys that make up the oceans to a certain depth, and that depth is sea level. When water is poured into a container, the surface of the water will always be flat, no matter how flat
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Watch this on YouTube Is Earth an open or closed system? It is both. For some things it is open and for others, it is closed. Earth is an open system for energy. Most of the energy on Earth comes from the sun. Energy enters Earth from outer space as well, but the sun is
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Watch on YouTube Why is Broadway so long? Before it became a road it was originally the Wickquasgeck trail. Broadway is a street that runs through Manhattan. It is famous for having many of New York’s theaters on it. It is actually much longer than people think and stretches for 53.2 km. It starts at
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Watch on YouTube Are Inner and Outer Mongolia separate countries? Outer Mongolia is the country of Mongolia and Inner Mongolia is a part of China. Outer Mongolia is known as Mongolia and has an official language of Mongolian, although many people also speak Russian. It has a population of a little over 3 million people
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Watch on YouTube Why is the Grand Canyon so deep? Because of the power of the Colorado River, the amount of water in it, the arid climate, and the rocks it is made of. The Grand Canyon carves through the Colorado Plateau. It is 446 km long, 29 km wide, and 1,857 m deep at
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