Ensc 1
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The atmosphere is a layer of gases surrounding the Earth that protects life. It consists mainly of nitrogen and oxygen. The atmosphere prevents excessive radiation from reaching the Earth's surface, allowing life to survive. Mars has a thin atmosphere so it cannot support life like Earth. Ancient rivers and canyons on Mars show it may have been able to support life millions of years ago.
Ensc 1
- 1. What is atmosphere?The atmosphere is a layer of gases which surrounds the entire Earth.<br />It consists mainly of Nitrogen, Oxygen, as well as a few other<br />gaseous elements. The purpose of this \" layer\" around the Earth is to<br />prevent excessive amounts of radiation from reaching the Earth,<br />thereby allowing we, as animals/planets, to survive. A planet<br />such as Mars has very little, if any, atmosphere and hence has<br />little or no life on it (at least as we see it now). Several<br />million years ago Mars may have supported life. Has your class ever<br />seen pictures of the huge \" ancient rivers\" or Canyons on Mars. Many<br />scientists these formations could have been made by water, rivers, etc<br />many millions of years ago.<br /> <br />Part and layers of the atmosphere.The atmosphere of Earth is a layer of gases surrounding the planet Earth that is retained by Earth's gravity. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night.<br />Atmospheric stratification describes the structure of the atmosphere, dividing it into distinct layers, each with specific characteristics such as temperature or composition. The atmosphere has a mass of about 5 × 1018 kg, three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space. An altitude of 120 km (75 mi) is where atmospheric effects become noticeable during atmospheric reentry of spacecraft. The Kármán line, at 100 km (62 mi), also is often regarded as the boundary between atmosphere and outer space.<br />Air is the name given to atmosphere used in breathing and photosynthesis. Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. While air content and atmospheric pressure varies at different layers, air suitable for the survival of terrestrial plants and terrestrial animals is currently known only to be found in Earth's troposphere and artificial atmospheres.<br />Percent composition of our air.<br />Meaning of atmosphere, lithosphere, biosphere, hydrosphere?<br />The atmosphere whole mass of aeriform fluid surrounding the earth; applied also to the gaseous envelope of any celestial orb, or other body; as, the atmosphere of Mars.<br />The lithosphere is the solid outermost shell of our planet. The lithosphere includes the crust and the upper part of the mantle, and is made up of material from both the continents and the oceans on the Earth's surface.<br />In grade 10 have focused on the hydrosphere and the atmosphere. The lithosphere is also very important, not only because it is the surface on which we live, but also because humans gain many valuable resources from this part of the planet.<br />Biosphere: Part of the Earth's surface and atmosphere that contains the entire terrestrial ecosystem, and extends from ocean depths to about six kilometers (3.7 miles) above sea level. Not precisely demarkable, it contains all living organisms and what supports them soil, subsurface water, bodies of water, air and includes hydrosphere and lithosphere. <br /> Hydrosphere: A layer of water covering the upper mantle<br /> 1.How did the Earth Formed?<br /> HOW WAS EARTH FORMED?<br />Planet Earth was formed 4.6 billion years ago from the same nebula cloud of gas and dust that the Sun and the other planets were formed (similar to the one pictured to the left). However, Earth then was very different from Earth now, and it would have been impossible for life to exist on it. In fact, it is only quite recently in the Earth's 4,600,000,000 year long life that life, resembling modern-day life, has been possible, first with the dinosaurs over 200,000,000 years ago and now with humans and other animals. The Earth is still being formed now. It still has a molten centre which causes volcanoes to ocassionally erupt, and plates on the surface are constantly \" swimming\" meaning that they collide with other plates and cause earthquakes. On this page, we will look at how Earth may have settled to become like the planet it is now.<br /> <br />