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WEATHERING AND EROSION - Contenido educativo

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Subido el 27 de marzo de 2022 por Alicia M.

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This is Earth, home to seven billion plus people, seven continents, and all kinds of 00:00:00
amazing plants and animals. 00:00:14
This is what Earth has looked like for a long time, and will probably continue to look like 00:00:16
for a long time. 00:00:20
Right? 00:00:21
Yes. 00:00:22
And no. 00:00:23
Sure, this is what Earth looks like from space, but even though it looks pretty much the same 00:00:24
from whenever we view it from afar, once you zoom in on it, you can see it's always changing. 00:00:27
On a small scale, things like moving water shape the Earth's landforms, the natural 00:00:32
features of the Earth's surface. 00:00:36
On a bigger scale, the gradual shifting of the Earth's crust is slowly moving even 00:00:38
bigger things like the oceans and the continents. 00:00:42
So one day, our planet will look different, maybe a lot different from how it looks now. 00:00:45
So how exactly does water shape Earth's landforms? 00:00:50
Or to bring it back to the spheres we've been talking about, how does the hydrosphere 00:00:53
affect the geosphere? 00:00:57
To understand that, we need to discuss weathering. 00:01:02
I'm not talking about the weather, like if it happens to be sunny or cold or foggy 00:01:05
outside your window right now. 00:01:09
I'm talking about weathering, the process that takes place as rocks and other parts 00:01:10
of the geosphere are broken down into smaller pieces. 00:01:14
Weathering can be caused by water, air, chemicals, plants, or even animals, including us. 00:01:17
And there are two types of weathering you need to know about, mechanical weathering 00:01:22
and chemical weathering. 00:01:26
Mechanical weathering is the process of breaking big rocks into little ones. 00:01:27
Frost, ice, the roots of plants, running water, or heat from the sun can all cause mechanical weathering. 00:01:31
Chemical weathering involves the changes that some substances can cause in the surface of the rock 00:01:36
that make it change shape or color. 00:01:41
Things like carbon dioxide, oxygen, and acids can all cause chemical weathering. 00:01:43
And when rocks have been weathered and all broken down and are later moved by natural forces like wind, water, or ice, 00:01:47
that's called erosion. 00:01:54
Weathering and erosion sound pretty similar, right? 00:01:55
Well, yeah, but not exactly. 00:01:58
Think of weathering as the hammer that breaks down the rocks. 00:02:00
Erosion is the process that carries those rock fragments away, 00:02:03
or put in a way we're all familiar with. 00:02:06
Weathering helps make a mess, and erosion helps clean it up. 00:02:08
Let's take a trip to the beach to see what part the hydrosphere plays in weathering and erosion. 00:02:12
This is a picture taken from space of the coastline of Massachusetts in the northeastern United States. 00:02:20
It's part of a landform called Cape Cod, 00:02:25
and the picture shows what the beaches and islands around it looked like in 1984. 00:02:27
Now look at this photo from 2014. 00:02:31
What's different? 00:02:33
There are actually more islands in 2014 than there were before. 00:02:34
Back in 1984, that long strip of land was North Beach. 00:02:38
Now, that strip of land has been chopped up into separate islands. 00:02:42
The top part is North Beach, the middle area broke off into North Beach Island, and the 00:02:46
bottom part is now called South Beach. 00:02:50
So, how did that happen? 00:02:52
Well, moving water is a major cause of erosion, and there's a lot of moving water in the 00:02:54
Atlantic Ocean. 00:02:59
The intense energy of ocean waves crashing on shore causes pieces of the rocky, sandy 00:03:00
coastline to break into smaller pieces, or to weather over time. 00:03:05
Then, natural forces like major storms and rising sea levels then move or erode these 00:03:09
smaller pieces. 00:03:14
Day to day, you might not notice any dramatic changes, but over the course of 30 years? 00:03:15
Well, as these pictures show, coastlines can change a lot. 00:03:20
So what can we take away from this? 00:03:24
Well, we saw that water can weather 00:03:30
and erode Earth's landforms, and that's just one example. 00:03:32
There are so many others, like floods weathering valleys 00:03:35
or glaciers eroding mountains. 00:03:38
Let me break it down for you this way. 00:03:41
See what I did there? 00:03:43
The hydrosphere shapes and sometimes moves the geosphere. 00:03:44
One last joke before I sign off. 00:03:48
What did the geosphere say to the hydrosphere? 00:03:50
You crack me up. 00:03:52
Subido por:
Alicia M.
Licencia:
Dominio público
Visualizaciones:
145
Fecha:
27 de marzo de 2022 - 19:43
Visibilidad:
Público
Centro:
IES LA SENDA
Duración:
04′ 05″
Relación de aspecto:
1.78:1
Resolución:
1920x1080 píxeles
Tamaño:
109.07 MBytes

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