01-02-2010
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#6
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حـــــوراء.**.الحصــن
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 من مواضيعي |
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اقتباس:
المشاركة الأصلية كتبت بواسطة عفوك إلهي
Thank you for your presentation I consider this to be submitted for oral presentation in front of teacher and student. so I want a brief and very simple presentation about our planet Earth
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هذا طلبك عفوك آلهي..
إن شاء الله أكون أفدتك..
 Earth is the only inner planet in our solar system that has liquid water on its surface. Seventy percent of the surface is covered by oceans where photosynthesis takes place. This makes the ocean the principal life habitat on Earth.
Earth's amazing gaseous atmosphere is responsible for making life possible on this, the third planet from the Sun. Our atmosphere contains water vapor which helps to moderate our daily temperatures. Our atmosphere contains 21% oxygen, which is necessary for us to breathe, 78% nitrogen, and .9% argon. The other 0.1% consists of water vapor, carbon dioxide, neon, methane, krypton, helium, xenon, hydrogen, nitrous oxide, carbon monoxide, nitrogen dioxide, sulfur dioxide, and ozone. These latter elements are important to have because they help to absorb harmful solar radiation before it can reach the surface of the Earth. If present in larger amounts, most of these latter elements would be poisonous to humans. The atmosphere protects us from meteors as well. Due to the friction generated between a meteor and the atmospheric gases, most meteors burn up before hitting Earth's surface as a meteorite.,,
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