The Principle Events In The Evolution Of The Earths Atmosphere Essay Example For Students

The Principle Events In The Evolution Of The Earths Atmosphere Essay The Principle Events In The Evolution Of The Earths AtmosphereThe Principle Events in the Evolution of the Earths AtmosphereThe literal translation of the word atmosphere is sphere of vapors. The Earths atmosphere is a protective sphere of vapors, or air that surrounds the Earth and provides it with a layer of insulation from the harmful rays of the sun. It is a vital part of the Earth, and has changed dramatically since the beginning of time. The earths atmosphere has gradually changed since the Earths birth approximately 4.6 million years ago. In the beginning, the Earths composition was very different that how it exists today. A long time ago the Earths atmosphere was very similar to todays Venus and Mars atmosphere. It had about 95% carbon dioxide, 2-3% nitrogen, and very little, less than 1% oxygen. Today the Earth contains 79% nitrogen, 21% oxygen, and 3% water vapor. It is evident that there were many events that happened over billions of years that have contributed to this change in the Earths atmosphere. We will write a custom essay on The Principle Events In The Evolution Of The Earths Atmosphere specifically for you for only $16.38 $13.9/page Order now The Earth had developed so drastically because of the tremendous dust and gas cloud within the Milky Way galaxy. The Earth grew larger as huge meteorites hit it, and the surface was covered with dust. Volcanoes began to form and emitted lava, ash, and most importantly gases. Carbon dioxide, water vapor, and nitrogen were released into the atmosphere from the volcanoes. This process is called outgassing, and took place within the first million years or so of the Earths formation. Then, about 4 billion years ago, the planet cooled, and the outgassed water vapors condensed into clouds. It rained and produced the oceans, and even enough to cover 95% of the Earth. In addition, because it rained, there was less carbon dioxide in the atmosphere. The carbon dioxide was lost over billion of years, as the ocean formed there was a chemical reaction in which carbon dioxide and water formed carbonic acid. It is shown in the equation CO2 + H2O = H2CO3. The carbonic acid dissolved oceanic rock into sand, silt, and mud. It is evident because of this geochemical process occurred there is more carbon in the rocks and minerals and there is less in the Earths atmosphere. The Earths first ever oxygen emerged about two millions years ago because of ultraviolet radiation. The water in the Earths atmosphere was split into oxygen and hydrogen because of the ultraviolet radiation from the sun. The equation for this process is UV-* 2H20 -* 2H2 + O2. The first ever oxygen is from the ultraviolet radiation that occurred in the Earths atmosphere. It is interesting to note that 600 million years ago only about 1% of the Earths atmosphere was oxygen. Significant quantities of oxygen did not begin until plants arrived on the scene. The percentage of oxygen increased when plant life evolved and photosynthesis began to happen on the Earth. The first ever plants were blue-green algae, which lived the Earths oceans. Plants used sunlight, water, and carbon dioxide to make their food in a process called photosynthesis. The process of photosynthesis can be easily seen in the equation 6CO2 + 6H2O = C6H12O6 + O2. The plants breathe in carbon dioxide and then release oxyge n during photosynthesis, within 500 million years oxygen was the second largest part of the atmosphere after nitrogen. As oxygen became a greater part of the atmosphere the ozone shield emerged. The shield was formed when solar ultraviolet radiation forces the reaction for oxygen to form ozone, also known as 03. The ozone protects the Earth and its inhabitants from the harmful radiation from the sun. In conclusion, the Earths atmosphere has changed dramatically since the Earths origin about 4.6 billion years ago. There are many factors that contributed to this change over time. By getting a better understanding of our Earths atmosphere we can use in many useful ways. We can use this knowledge of the atmosphere for a worthy cause in many areas of science and greatly benefit from it. Science

Girls Who Invest Essay Sample

Girls Who Invest Essay SampleWhat's with the girls who invest essay sample? You've probably seen them in the last several years. You'll see that they always have those typical teenage things, like people power, weird fashions, and in this case, a lot of cash.You might not think that it is possible to find girls who invest essay sample in school. But I'm sure you're going to change your mind once you get a glimpse of the one who gave away some money. The girl that you'll see will look like all the others in her class, only that she has a little something extra, and she looks like she's doing well with her life. That is the girl that you are going to meet when you visit the website of the company that offers this service.We live in a fast paced world where the problem of competition between businesses and companies cannot be ignored anymore. It is simply impossible to go on without businesses making their presence felt. And they are especially interested in engaging students for that p urpose.There are so many different aspects of a business that you could get your hands on if you talk to the girls who invest essay sample. The first aspect would be the essay part. This is the main part where students demonstrate their knowledge about a certain subject or topic.The proper way to tackle the subject matter is to use a personal approach. Students need to find the connection between the objective and the audience that they are trying to reach. That's why the girl who invests essay sample actually contacts the company for the purpose of gaining a personal connection and increase her exposure.Of course, you won't get a personal touch if you choose to promote a brand or a product, but if you make use of what you know, you can still build your own brand. Since the company that you will work with is usually eager to get something more from you, they usually give you the opportunity to invest some of your own money into the process. And by investing your own money, you'll ge t a lot of benefits in return.And after that, you have the option to show them how good you are in the corporate world. With that being said, the girls who invest essay sample are usually very excited about the prospect of showing off. They like the thought of getting a chance to get more exposure that way.I'll never forget that I had the chance to engage with these girls a few years ago when I went to a talk hosted by a group of college students. Those girls who invest essay sample were really amazed that I was able to earn as much as I did in an afternoon from just one conversation. They all had so much fun talking with me, too.