Earth, Science

Assignment Help:

Earth

How do we describe the 'big ball' on which we live? Seen from space, it appears as a bluish-white sphere. Its wealth of plant and animal life, snow covered peaks, blue oceans and white clouds make the Earth a beautiful planet. Human beings have explored it extensively. Yet, the first hand knowledge of  the Earth is limited to a thin shell of  rock and water extending to a few kilometres below the surface, and to the atmosphere above. However, using indirect methods, such as the study of waves generated during earthquakes, scientists have been able to picture the Earth's interior. without ever seeing or sampling it. We will now briefly describe the current scientific knowledge about the Earth. 

 

1094_Earth.png

The Earth's  atmosphere has been studied extensively with  the help of ground based experiments, aircraft, rockets and balloons. Though it  is not divided  into distinct layers, it-is helpful to think of  the atmosphere in this way. The troposphere, nearest to the surface,  is made up of  78 per cent nitrogen and 21 per cent oxygen, with water vapour, carbon dioxide, neon and argon making up most of  the remaining one per cent. It has an average temperature of about 16°C at sea level and-  16OC near its top. The stratosphere, coming next contains ozone and has a temperature ranging from -  16OC to -4OC.  This ozone layer absorbs the harmful UV radiations fron, the Sun,  thus protecting us from them. The carbon dioxide in the Earth's atmosphere traps heat and makes it warmer through the greenhouse effect. Were it not for this, the Earth's surface temperature would be much lower and it would always be covered with ice.


Related Discussions:- Earth

Define the nature of sound, Define the Nature of Sound This section is ...

Define the Nature of Sound This section is a recapitulation of what you have learnt in school. You would recall that sound waves consist of the longitudinal waves of alternate

Food allergies, Food allergies: Food allergies are different from food ...

Food allergies: Food allergies are different from food fads. Certain fds  seem to have strange reactions on some people. Probably, you have come across a person who got skin ra

Explain maximum tubular secretory capacity - urine formation, Explain Maxim...

Explain Maximum Tubular Secretory Capacity The maximum rate at which tubules can transport a substance from the blood vessel to the lumen or from the lumen to the blood vessel

Respiration, Respiration:  Food +  oxygen ->  carbon dioxide + water + ...

Respiration:  Food +  oxygen ->  carbon dioxide + water +  energy  Food is not only a source of energy, but also the nutrients used to build up the organisms' bodies. So we

Science project, i dont know how to set up my science board

i dont know how to set up my science board

Write a short note on ozone in the atmosphere, Question: a) How does te...

Question: a) How does temperature changes in the stratosphere? Give a physical explanation and illustrate your answer using a diagram. b) Write a short note on ozone in the

CELLS, Are there living beings without cells?

Are there living beings without cells?

Botany, Hey, I have to ask an expert questions for an assignment and I was ...

Hey, I have to ask an expert questions for an assignment and I was wondering since you have a degree in botany how would a multi vitamin affect a plant?

Explain acute phase proteins, Explain Acute Phase Proteins Following an...

Explain Acute Phase Proteins Following any infection, there is a rise in concentration of several plasma proteins. The best known amongst them are C- reactive proteins (CRP) wh

Types of energy, give examples for one energy transformed to another energy...

give examples for one energy transformed to another energy

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd