[안다과학] 물이 왜이렇게 더럽지?!

<p style="text-align: left;">‘정수’ 실험을 했어요!<br>더러운 물을 깨끗하게 만드는 것을 정수라고 해요!<br>하수처리장에서는 쓰고 버린 더러운 물을 깨끗하게 정수 처리장에서는 호수, 저수지에 있는 물을 더욱 깨끗하게 정수하여 가정으로 보낸답니다! <br><br>더러운 물을 깨끗하게 만드는 정수 과정을 실험해 보았는데요! 거름종이를 깔고 모래와 활성탄 그리고 자갈 순으로 넣어주고 흙탕물을 부어 깨끗해지는 물을 관찰해 보았습니다!😊<br><br>그리고 물을 오염시키지 않으려면 어떻게 해야 하는지도 알아보았는데요! 세수나 양치할 때 물을 받아서 하고, 기름이나 오염물질을 하수구에 버리지 않기! 또 쓰레기는 쓰레기통에! 주방 세제, 샴푸 등 합성세제를 적게 쓰기! 꼭 지킬 수 있도록 우리 모두 다 같이 노력해보아요🫶♥️</p><div class="figure-video" data-ke-type="video" data-video-url="https://kakaotv.daum.net/embed/player/cliplink/rv9qs0ww0rlkx4d2ps94o6n5t@my?service=daum_cafe" data-video-host="kakaotv" data-video-play-service="daum_cafe" data-video-width="1920" data-video-height="1080" data-ke-style="alignCenter" data-video-thumbnail="https://thumb.kakaocdn.net/dna/kamp/source/rv9qs0ww0rlkx4d2ps94o6n5t/thumbs/3.jpg?credential=TuMuFGKUIcirOSjFzOpncbomGFEIdZWK&expires=33254291219&signature=56w%2B%2F1bVNA3qZ9%2FYl%2BaSgaLC50w%3D" data-ke-mobile-mobileStyle="widthFull" data-video-origin-width="1920" data-video-origin-height="1080"><iframe src="https://kakaotv.daum.net/embed/player/cliplink/rv9qs0ww0rlkx4d2ps94o6n5t@my?service=daum_cafe&ptoken=v2_7e5d75c01002db2dbd4d821b7cb6167a4df49751163e8aa9aab2b8a13bfdf47f8042fe6fb9ab357d680e272bc20ed256d3bf1b7ff48288d145b876d7bd" width="1920" height="1080" frameborder="0" scrolling="no" allowfullscreen="" allow="encrypted-media"></iframe><div class="figcaption"></div></div><div class="imagegridblock" data-ke-type="imageGrid"><div class="image-container"><span data-url="https://t1.daumcdn.net/cafeattach/15cn6/62d977573f833f0034f8bf4cf1a05d8f24c9a332_re_1697382422130" data-origin-width="1024" data-origin-height="1365" style="width:50.00%; 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