Earth Timeline by Lakshanya Muthuvittil Vineesh https://padlet.com/muthuvl28/ef0he0qdz6yyvxko Scroll to view en-us 2025-07-18 02:44:01 UTC 2025-07-18 03:44:51 UTC hello@padlet.com https://padlet.net/icons/png/1f39e.png 4.6 billion years ago (bya) muthuvl28 https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522933608 Earth had just formed and its atmosphere was made mostly of gases like hydrogen and helium. It was super hot with lots of volcanic activity, and there was no oxygen. Life didn’t exist yet.

]]> 2025-07-18 03:28:34 UTC https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522933608 4.0 bya-2.5 bya muthuvl28 https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522935950 The atmosphere was full of poisonous gases like methane and ammonia. There was some water vapor too. Sunlight caused chemical reactions that started breaking down those gases and forming new ones like nitrogen and carbon dioxide.

]]> 2025-07-18 03:31:17 UTC https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522935950 2.6 bya- 400 million years ago (mya) muthuvl28 https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522943317

  • Tiny bacteria began using sunlight to make food with a process called photosynthesis. They took in carbon dioxide and released oxygen. Over time, oxygen levels grew and ozone formed high up, protecting life from the Sun’s UV rays.


    • ]]>     2025-07-18 03:38:32 UTC https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522943317     400 mya- 290 mya muthuvl28 https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522945790 Green plants began growing on land. This helped increase oxygen in the atmosphere even more. The Earth started looking more like it does today. Oxygen helped support more complex life.

    ]]>     2025-07-18 03:40:44 UTC https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522945790     290 mya- present muthuvl28 https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522948401 Oxygen and carbon dioxide levels balanced out. The atmosphere became what we have today which is mostly nitrogen, some oxygen, and tiny amounts of other gases. The ozone layer protects life, and the atmosphere supports animals and humans.

    ]]>     2025-07-18 03:43:35 UTC https://padlet.com/muthuvl28/ef0he0qdz6yyvxko/wish/3522948401