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LANDFORMS - Contenido educativo
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Look outside your window for a sec and you'll probably see some buildings and streets, maybe
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telephone poles, hopefully some trees in there too.
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A lot of the world that we live in has been shaped by people, and hey, no complaints because
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I'm plenty comfortable right here.
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But people aren't the only ones moving things around and shaping our world.
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Wind, rain, and other elements do it all the time, making shapes out of the earth we call
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landforms.
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So what are some kinds of landforms, and how are they made?
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Just remember that the Earth is made of several spheres, including the hydrosphere, biosphere,
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atmosphere, and geosphere.
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The solid part of the Earth, or geosphere, may look pretty stable, but it's always changing.
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Weathering and erosion by wind and water are constantly reshaping what our planet's surface
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looks like, and even if it takes so long that we don't usually notice it, it's happening.
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Let's check out our map to explore what kinds of landforms there are around the world.
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Mountains are probably some of the most well-known landforms.
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Basically, they're just really big hills, with steep sides that stretch way above the surface of the Earth.
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Many mountains are formed when large plates, or pieces of the Earth's surface, collide and are forced upwards.
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The low spaces in between, we call those valleys.
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But if mountains don't peak your interest, how about plateaus?
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Plateaus are also tall landforms, but unlike mountains, which tend to have the pointy tops we know as peaks, plateaus have flat tops.
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Plateaus come in lots of sizes.
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If they're medium-sized, for example, they're called mesas, which is the Spanish word for table,
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which is highly appropriate since plateaus kind of look flat and long, like tables.
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And if they're smallish, they're called buttes.
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No matter what they're called or what size they are, plateaus can form in lots of different ways.
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Sometimes they're caused by the erosion or wearing away of mountains,
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like by water or really big pieces of ice.
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Other plateaus are made by magma, which is really hot, melted liquid earth below the surface.
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When magma swells up below the surface but can't break through,
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it can push up a flat chunk of land, leaving that table-like formation behind.
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And speaking of magma, let's go to the Pacific Ocean on our map
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for a good look at the most explosive landforms, volcanoes.
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These landforms are found where the surface of the Earth is relatively thin.
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When magma breaks through the surface or erupts,
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that hot liquid rock gets a new name, lava,
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and a new volcano is born, hot stuff coming through.
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Hot is definitely a good term to describe another kind of landform, deserts.
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Deserts are landforms that lose more water to air
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than they get through rain, snow, or other kinds of moisture.
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The world's largest desert is the Sahara in northern Africa,
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where daytime temperatures can climb to a sweltering 55 degrees Celsius.
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Just a wee bit out of my personal comfort zone.
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But then again, so are the cold temperatures in Antarctica,
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which is actually considered to be a desert too.
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Penguins in the desert. Who knew it, right?
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Time to set sail for two more kinds of landforms, islands and deltas.
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You'll find deltas at the mouth or end of rivers where they meet the ocean.
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Deltas are formed when dirt and other debris that are washed down the river accumulate
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or build up to form a piece of land.
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Islands, on the other hand, can form any number of ways.
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They might come from the cooled lava of underwater volcanoes, or from a whole lot of dirt, sand,
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and pieces of coral building up due to ocean currents.
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Islands can even form by breaking off from a larger piece of land, so they can form in
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lots of ways, but as long as it's surrounded on all sides by water, it's an island.
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In our travels today, we took a look at lots of different kinds of landforms, which are
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natural features of the Earth's surface.
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Landforms can stretch high above the Earth's surface, like mountains, plateaus, or mesas,
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Be created in or by water, like deltas and islands, or even be dry, like deserts.
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So remember these things the next time you step outside.
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Underneath and beyond and all around the things that people have made, there are landforms,
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millions of years in the making.
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- Subido por:
- Alicia M.
- Licencia:
- Dominio público
- Visualizaciones:
- 79
- Fecha:
- 4 de marzo de 2022 - 17:54
- Visibilidad:
- Público
- Centro:
- IES LA SENDA
- Duración:
- 03′ 57″
- Relación de aspecto:
- 1.78:1
- Resolución:
- 1920x1080 píxeles
- Tamaño:
- 105.66 MBytes
