Stratification, Biology

Stratification

On the basis of the variation in air temperature. the atmosphere has been divided vertically into four layers: (figure shown below) thee troposphere, stratospG, mesosphere and thermosphere.

572_stratification.jpg


Troposphere or the lowermost layer extends up to an altitude of 15 km at the equator to 8 km at the poles. The temperature in this zone decreases with increasing altitude or height.

The next layer, the stratosphere, extends up to an altitude of approximately 50 km. Here a gradual increase in temperature occurs with altitude. Pilots of jet aircraft prefer to fly in the stratosphere as it is relatively stable and free from weather fluctuations apart from providing excellent visibility. Scientists are womed about the growing pollution in the stratosphere. As pollutants enter into this zone, they are likely to remain here for a long time. We shall be elaborating this later.

In mesosphere, the next layer, temperature is constant in the lower portion but then rapidly decreases with altitude. At 80 km the temperature is the lowest in the atmosphere (average -90" C). Above this is the thermosphere in which the temperature again increases at higher altitudes. Human activity at present seems to have little direct impact on the outermost atmospheric layer.

 

Posted Date: 12/10/2012 6:55:32 AM | Location : United States







Related Discussions:- Stratification, Assignment Help, Ask Question on Stratification, Get Answer, Expert's Help, Stratification Discussions

Write discussion on Stratification
Your posts are moderated
Related Questions
What is Lactation? High levels of estrogens and progesterone during pregnancy stimulate the breasts to develop prior to lactation, or milk production. At the same time, levels

Of which type of defense cell do worm infections stimulate the multiplication? The major leukocytes that generally multiply and participate in the defense against worm infectio

Q. Explain Restricted fragment polymorphism? This method makes use of a group of enzymes termed restriction enzymes which recognise particular sequence of DNA and act as "molec

How do the sodium and potassium ions maintain the resting potential of the neuron? The plasma membrane of the neuron when at rest maintains an electric potential difference amo

Q. Explain about S-Shaped incision for a mini pedicle flap? The S - shaped incision is indicated where a papilla needs to be developed and was first described by Palacci. This

Q. Drugs and Insulin used in diabetes? When diet, exercise or even weight reduction do not improve the diabetic symptoms and blood sugar levels, the uses of hypoglycemia drugs

Explain National Nutritional Anaemia Prophylaxis Programme (NNAPP)? In past, both access to and intake of iron-folate tablets have been poor in children and therefore had a lit

What is the difference between ectoparasite and endoparasite? Ectoparasites are parasites that explore the external surface of the host (as, for example, mites that parasite th

Q. What do you mean by Periodical? A periodical is a publication appearing at regular intervals. Each issue is called a number and collectively these numbers comprise a volume.

In biology, a species is smallest and basic unit of classification. Each species is placed within a single genus. For example biological name of human being is homosapiens. Here ho