A Change of Scenery: Crash Course Kids #17.2 - By Crash Course Kids
Transcript
| 00:09 | I love change . It gives me something to look | |
| 00:12 | forward to . A new book to read . A | |
| 00:14 | new flavor of ice cream to try or a snazzy | |
| 00:16 | new pair of specs . If it's new and different | |
| 00:19 | I say bring it and if you think about it | |
| 00:20 | changes all around us . Seasons changes . The earth | |
| 00:23 | travels around the sun , clouds in the sky change | |
| 00:26 | shape . The ground beneath our feet is constantly moving | |
| 00:29 | . That's right . The earth's geo sphere , a | |
| 00:31 | stationary as it seems is actually moving . And because | |
| 00:34 | of all of this , all of the land forms | |
| 00:36 | , that is the features of the earth's surface . | |
| 00:38 | Like mountains and deserts are constantly changing alrighty then . | |
| 00:41 | But how how do landforms form and change over time | |
| 00:46 | ? Mhm . Well the first thing you need to | |
| 00:51 | know is that the top most layers of the earth | |
| 00:52 | are made up of plates despite their name , these | |
| 00:55 | are nothing like dinner plates you can think of the | |
| 00:57 | most big thick pieces of soil and rock and I | |
| 01:00 | mean big . The north american plate covers all of | |
| 01:03 | north America plus Greenland and parts of northern Asia . | |
| 01:06 | And these parts are moving slowly so slowly . In | |
| 01:09 | fact that we don't even notice them moving . The | |
| 01:11 | plates cruise along at about 2 to 5 centimetres a | |
| 01:14 | year , which is about as fast as your fingernails | |
| 01:16 | grow . These plates can move away from each other | |
| 01:18 | toward each other or even slide over top one another | |
| 01:21 | and sometimes their movement causes landforms to change , but | |
| 01:24 | landforms can also change slowly in other ways through things | |
| 01:27 | like erosion and weathering . You already know that these | |
| 01:30 | are powerful forces that change rock through the effects of | |
| 01:32 | wind , water and ice . Mhm . For example | |
| 01:38 | , the Grand Canyon in Arizona was formed by the | |
| 01:40 | colorado River and other forms of water slicing through a | |
| 01:43 | plateau of rock through erosion over many , many , | |
| 01:45 | many years . If you're the impatient sort though , | |
| 01:48 | have I got news for you ? Sometimes landforms can | |
| 01:51 | change quickly , I mean really quickly , as in | |
| 01:54 | within a few minutes . So let's take a look | |
| 01:56 | at different ways that landforms can change By exploring a | |
| 01:58 | couple of particularly famous examples . Let's start with one | |
| 02:01 | of nature's most famous quick changes . A volcano in | |
| 02:03 | the pacific northwest of the United States called Mount ST | |
| 02:06 | Helens did some serious land form rearrangement in May of | |
| 02:09 | 1980 . The surface of the earth went from this | |
| 02:11 | to this in a matter of minutes , the force | |
| 02:14 | of the eruption caused the largest landslide in history , | |
| 02:17 | which changed even more the way the land looked and | |
| 02:19 | still looks today , all around the mountain . But | |
| 02:21 | most landforms change much more gradually by gradually , I | |
| 02:25 | mean so slowly that we don't even notice them changing | |
| 02:27 | at all . The Grand Canyon is a great example | |
| 02:29 | of this , but it's not the only one in | |
| 02:31 | the early 18 hundreds , a group of explorers some | |
| 02:33 | of the cross , a really cool rock formation in | |
| 02:35 | the White Mountains of New Hampshire . Because the shape | |
| 02:37 | of the land form looked like the profile of an | |
| 02:39 | old man . It was nicknamed the Old Man of | |
| 02:41 | the mountain geologists think that this old man was probably | |
| 02:44 | created through erosion by glaciers , big slowly moving sheets | |
| 02:47 | of ice over 200 million years ago and there the | |
| 02:50 | old man stayed exposed to wind in snow and ice | |
| 02:53 | . In other words , weathering and more erosion , | |
| 02:55 | he looked pretty much the same for millions of years | |
| 02:57 | until 2000 and three when finally the whole formation tumbled | |
| 03:00 | off the side of the mountain . The old man | |
| 03:02 | of the mountain is a great example of how landforms | |
| 03:04 | are both created and continuously changed in ways we don't | |
| 03:07 | even notice until we notice them . So now maybe | |
| 03:14 | , you know what I mean ? When I say | |
| 03:15 | that the earth is always changing landforms as we know | |
| 03:18 | them , won't look the same forever because these features | |
| 03:20 | on the Earth's surface can change over time . They | |
| 03:22 | can change quickly , like when a volcano erupts , | |
| 03:24 | or they can change slowly through processes like weathering and | |
| 03:27 | erosion . When wind and water change the shape of | |
| 03:29 | mountains or cause canyons to form and that's totally fine | |
| 03:32 | with me . I can always go for a change | |
| 03:34 | of scenery . |
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