Why No Polar Pineapples: Crash Course Kids #11.2 - By Crash Course Kids
Transcript
| 00:09 | plants are awesome . They're usually quite pretty . The | |
| 00:12 | bigger ones provide shade in the summer . Many of | |
| 00:14 | them have flowers and some of them are downright tasty | |
| 00:17 | . They even do something that most other living things | |
| 00:19 | on earth can't do . Plants take the energy from | |
| 00:22 | the sun and change it into chemical energy through photosynthesis | |
| 00:26 | . This is the energy that they use to grow | |
| 00:28 | . I'm sure you already realize that certain plants , | |
| 00:30 | like pineapples only grow in certain places , specifically places | |
| 00:34 | that are tropical , warm , sunny and a really | |
| 00:37 | nice place to take a vacation . But you don't | |
| 00:39 | naturally find pineapples in the same places as you do | |
| 00:41 | penguins . But why is that ? Why do some | |
| 00:44 | plants grow in certain areas of the earth and not | |
| 00:47 | others ? Like so many things , the answer has | |
| 00:54 | to do with the sun . The Earth orbits the | |
| 00:56 | sun every 365 days . It takes this trip tilted | |
| 01:00 | on an invisible line called its axis . This tilt | |
| 01:03 | means that the sun's light doesn't hit the Earth evenly | |
| 01:06 | . You know this from when we talked about the | |
| 01:07 | seasons and why they happen . But seasons aren't the | |
| 01:10 | only thing caused by Earth's tilt . Some parts of | |
| 01:12 | the earth specifically near the equator , get a lot | |
| 01:15 | of direct sunlight or sunlight that being straight down instead | |
| 01:18 | of an angle , direct sunlight is pretty intense and | |
| 01:21 | hot . So the areas around the equator are warm | |
| 01:23 | all the time . Now . The opposite is true | |
| 01:26 | . For the polls , they get a lot more | |
| 01:28 | indirect sunlight or sunlight that strikes the earth at a | |
| 01:31 | shallow angle All year . Long and angled race are | |
| 01:34 | a lot weaker so they're less warm . And this | |
| 01:36 | explains why there are no pineapples at the south pole | |
| 01:39 | . How , mm Let's say you go to bean | |
| 01:45 | seeds in the same conditions in the same room , | |
| 01:48 | same amount of soil , same amount of water daily | |
| 01:50 | , even the same kind of pot . Then let's | |
| 01:52 | say you put one in direct sunlight like on a | |
| 01:54 | window sill and the other across the room on the | |
| 01:56 | table . And then you wait after about three weeks | |
| 01:59 | , if you compare the plant grown in direct sunlight | |
| 02:01 | with the one grown in indirect sunlight , you'd see | |
| 02:03 | that the one grown in direct sunlight is a lot | |
| 02:05 | bigger . Not to mention happier and healthier if greenness | |
| 02:08 | is any indication and why shouldn't it be it's had | |
| 02:10 | more sunlight to change its energy through photosynthesis . And | |
| 02:13 | that energy means more growth . And if you compare | |
| 02:16 | the temperature on the window sill to the temperature on | |
| 02:18 | the table , you'd see that the plant by the | |
| 02:20 | window was growing in warmer temperatures to since the equator | |
| 02:23 | gets direct sunlight all year long , it has warm | |
| 02:26 | temperatures all year long . So picky plants like pineapples | |
| 02:29 | which take a long time and a lot of energy | |
| 02:31 | to produce that yummy fruit are able to grow their | |
| 02:33 | , but pineapples at the polls , nope , there's | |
| 02:36 | just not enough energy from the sunlight there to give | |
| 02:38 | the plant what it needs to survive . Yeah , | |
| 02:44 | so the Earth's tilt on its axis means the areas | |
| 02:47 | around the equator get direct sunlight all year long . | |
| 02:50 | This means warm temperatures throughout the year and the areas | |
| 02:53 | near the Earth's poles get in direct sunlight all year | |
| 02:56 | long , which means colder temperatures throughout the year . | |
| 02:59 | Since plants need sunlight for photosynthesis areas that get a | |
| 03:02 | lot of direct sunlight , like around the equator are | |
| 03:04 | home to lots of plants , especially the ones that | |
| 03:07 | take a long time to grow . And that's why | |
| 03:09 | there are no pineapples at the pole . So all | |
| 03:11 | I'm saying is if you happen to be traveling to | |
| 03:13 | the north or south pole sometime soon and you really | |
| 03:16 | really like pineapple , you should just plan on packing | |
| 03:19 | some with , you don't say I didn't warn you |
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