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Earth
Earth
Earth
Earth
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Earth

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I had to make a power point about earth for my science class and so i thought that i could help other people too.

I had to make a power point about earth for my science class and so i thought that i could help other people too.

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  • 1. Hello !!! This power point will tell you all about our planet earth.
  • 2. http;//motivate.maths.org/life earth In the next few pages you will see a article that was found in the website below the title. So I thought you might find it interesting . hope you learn something out of it
  • 3. The first thing we need is the right chemical elements: oxygen hydrogen carbon iron silicon calcium nitrogen These elements aren't needed just to make up living things, but also to build an earthlike planet that the life can live on. When the first stars were formed there were no elements yet created except for the three lightest ones (hydrogen, helium, and lithium), and you can't make large molecules or earthlike planets from those, so life as we know it was not yet possible. Heavier elements like carbon and oxygen are made in stars like the Sun, but the even heavier elements, such as iron, are only made in the heaviest stars that explode as supernovas. When these stars explode, they spread the newly made elements through the universe, and only once this had started to occur could earth-like planets be made. Life on earth is extremely varied, but it requires the formation of large molecules like DNA, which is involved in the mechanism by which cells replicate themselves. DNA is an organic compound (based on the element carbon), which consists of a huge, complicated molecule that contains all the information necessary for building an organism. A carbon atom can bond with up to 4 other atoms, which is useful for making the long chains of complicated molecules - many of the molecules of which living organisms on

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