7A-B02 BAUTISTA ENVISCI STORYBOARD
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- When Earth formed 4.6 billion years ago from a hot mix of gases and solids, it had almost no atmosphere. Thesurface was molten. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. Itincluded hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today’s atmosphere.After about half a billion years, Earth’s surface cooled and solidified enough for water to collect on it.
- During the Archean Eon, methane droplets in the air shrouded the young Earth in a global haze. There was no oxygen gas on Earth. Oxygen was only in compounds such as water. Complex chemical reactions in the young oceans transformed carbon-containing molecules into simple, living cells that did not need oxygen to live. Instead they made energy out of sulfur and other elements.
- Around 2.3 billion years ago, lots of blue and green algae began to buildup in the oceans, causing a huge outburst of life. Plants began to grow after a while too! The Carbon Dioxide levels of the atmosphere began to decrease, as the Carbon was being used in photosynthesis. To balance this equation, though, we need to release this Oxygen somewhere: the atmosphere.6CO2 + 6H2O --> C6H12O6 + 6O2
- By 600 million years ago, the oxygen in the atmosphere reached about one-fifth of today’s level (21 percent). The oxygen boom favored the evolution of life forms that could use oxygen to create energy.Then about 430 million years ago, life on land appeared. Small plants and invertebrates (animalswithout backbones) evolved the ability to live on land and use oxygen directly from the atmosphere. During theDevonian Period, 416-397 million years ago, plants evolved, as did the first four-footed animals.
- During most of the past 290 million years, Earth was much warmer than it is now. Scientists understand thatchanges in the atmosphere affect Earth’s climate. Between 200 and 45 million years ago polar ice caps weresmall or absent, and winters were warmer around the globe. In these warm climates, many types of plants andanimals lived in the polar regions.Here is the following composition of today's atmosphere:1) Nitrogen -- 78%2) Oxygen -- 21 %3) Argon 0.9%4) Carbon Dioxide & other gases -- 0.1%
- Unfortunately, we are damaging our planet by burning tons and tons of fossil fuels, increasing CO2 levels faster than they can be removed! Humans just keep cutting down tress and wildlife for their own pleasure of adding places for our growing population to live in. This does, however, mean the Carbon Dioxide can't be used/broken down in photosynthesis as much, so we are just slowing killing the planet.#SaveourEarth#SaveOurAtmosphere
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