What made life possible on earth? By Joel Davis

What makes life possible on earth? There are many different factors that make life possible here on earth, such as temperature, water, sunlight, atmosphere, the moon and many others. Each of these has a specific job in making life possible. Whether its keeping oxygen in the air or keeping the earth at a safe temperature. Without even one of these factors life on earth wouldn't be possible as each of these factors are necessary to life. These are all the different factors that make life on earth possible.

Plants Plants are very important to our lives and are one of the many reasons we can live on this earth. Plants use photosynthesis which uses carbon dioxide, water, and sunlight to make glucose and oxygen. We as humans need oxygen to survive which is one of the many reasons plants are so important, as they are our number one source of oxygen. Plants such as trees can also be a source of food which then gives us energy. These are just a few reasons why plants are necessary to life on earth.

Water Water is one of the fundamental elements of supporting life. Without water there would be no life on earth. Humans need water to survive as we need to drink it and as it makes up a large portion of our bodies. Water is also one of the key elements of photosynthesis which provides us with oxygen. Water isn't just needed by humans but by all life and it makes up almost seventy percent of our earth. Water has a very large part in our every day lives and is possibly the most important factor to life on earth.

The sun The sun is the perfect distance from earth giving us enough heat without being to close or to far. If the sun was to close we would burn but to far and we would freeze. This means we are in the perfect spot, continuously orbiting the sun while at the right distance. The suns rays give us all energy and are needed to grow. Organisms like plants need the sun to go through photosynthesis and humans get energy and useful vitamins from the suns rays.

The atmosphere The atmosphere is a mix of many gases that surrounds earth and it has a very crucial job. The atmosphere protects us from the suns rays. While the suns rays are helpful they can also harm us through dangerous radiation. The atmosphere protects us from these rays while keeping the light and heat from these rays inside. Lastly the atmosphere has traces of carbon dioxide that keep the heat from the suns rays inside the earth in a greenhouse type effect but not quite so hot.

Conclusion There are still many other reasons why life is possible on earth but here were possibly the most important factors leading to life on earth. Without even one of these factors and there may have been no life on earth or it may have looked very different. Each of these different reasons for life has a different purpose that is necessary for life and our survival, and each of these has a different benefit to us. While this list is missing some other variables and factors these four are possibly the most important reasons of life and without them we wouldn't exist.

Sites used http://www.learnastronomyhq.com/articles/15-goldilocks-factors-that-allow- life-on-earth-to-exist.html http://www.livescience.com/31788-why-earth-perfect-for-life.html https://www.quora.com/Why-is-life-possible-on-earth-only