The layers of the atmosphere are classified according to changes in

Temperature

Explanation:

The layers of the atmosphere have been classified on the basis of the temperature of each layer that varies with the variation in altitude.

The layers of the atmosphere and the variation in temperature is given below:

1. Troposphere:

With the increase in altitude, there is a reduction in the temperature in this layer.

2. Stratosphere:

With the increase in altitude the temperature of the air also increases.

As Ozone is present in this layer, it absorbs most of the UV radiations making it warmer.

3. Mesosphere:

As a result of the decrease in the density of the air molecules, the temperature of this layer decreases with the increase in the altitude.

4. Thermosphere:

As a result of the absorption of the X-rays by the oxygen and nitrogen molecules, the temperature increases with increase in altitude.

most of them using statistics and defining how things are being measured

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.