Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
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.
Explain an Amniocentesis An amniocentesis is a process used to obtain a small sample of the amniotic fluid which surrounds the foetus to diagnose chromosomal disorders and open
Question 1 Define Hospital health information system. Explain its components. 2 Computerized medical information system allows more time to professionals for patient care. Expl
Why are nematodes agriculturally very important? Nematodes are the abundant soil microfauna. Being predatory and saprophytic in nature they cause a loss of vigour of the root
Define the Sympathetic Nervous System The sympathetic component of the autonomic nervous system is concerned with in- creasing the level of arousal and energy expenditure - pri
Burns : There are two types of burns which we are to discuss: 1) Chemical 2) Thermal Chemical burns have already been discussed in Sec. 16.7; so we shall discuss thermal
advantages and disadvantages of protozoa
Moving water by reducing air pressure Secure two small bottles. Fill single about half full of water and close it with a single-hole stopper carrying a length of glass tube tha
how is the soil colloidal material look like when ion and cation exchange capacity of the soil?
what is diffrence between rh positive and rh negative
Explain Cough reflex Actions - Respiratory Process Cough reflex causes cough due to irritation of some receptors in tracheo-bronchial tree. It is a protective reflex. The irrit
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd