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

Distributed artificial intelligence models or individualbase, (a) What are ...

(a) What are Agent-based models?  What are turtles and patches? How are turtles programmed in netlogo? If you have a background in computer programming or if you are brave, play ar

What is aldose-ketose isomerism, Aldose-ketose isomerism We  have  alre...

Aldose-ketose isomerism We  have  already  seen  that  in  a monosaccharide  either  an  aldehyde  (-€HO)  or  a ketone  (>C=O) group is present.  The former is called as aldos

Psychology, thesis writing with 40 pages, topic Mapping the criminal mind: ...

thesis writing with 40 pages, topic Mapping the criminal mind: Profiling and its limitation''.

Measuring atmospheric pressure with a bicycle pump, Measuring atmospheric p...

Measuring atmospheric pressure with a bicycle pump A bicycle pump with the washer reversed as represents can be used to calculate atmospheric pres- sure. The piston can be made

Explain the process of hearing, Explain the Process of Hearing The ears...

Explain the Process of Hearing The ears, as we all know, are sense organs for hearing. The ear consists of an external ear, a middle ear and an internal ear. It houses receptor

Explain the creatinine clearance test, Explain the Creatinine Clearance Tes...

Explain the Creatinine Clearance Test It determines how efficiently the kidneys are clearing creatinine from the blood and serves as an estimate of kidney function. It compare

The broad area of Scientific activity, Describe the factors which decide th...

Describe the factors which decide the broad area of Scientific activity

Explain sinus arrhythmia - electrocardiogram, Explain Sinus Arrhythmia - el...

Explain Sinus Arrhythmia - electrocardiogram In few adults and most children, there is raise in heart rate during inspiration and a decrease during expiration. This rhythm is m

The important physico-chemical properties of thiamin, The important physico...

The important physico-chemical properties of thiamin are as follows: a) Thiamin hydrochloride is a white, needle-shaped crystalline substance. b)  It has a characteristic sm

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