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1. The stratosphere was discovered in the early 1600s 1700s 1800s 1900s 2. Air p

ID: 153926 • Letter: 1

Question

1. The stratosphere was discovered in the early

       1600s           1700s           1800s           1900s

2. Air pressure and air density both decrease with increasing altitude.  Air temperature

       a. decreases with increasing altitude              b. increases with increasing altitude

       c. remains constant with increasing altitude   d. all of the above

3. The term anvil refers to the flat  TOP/BOTTOM  of a thunderstor

4. As you travel upward in the atmosphere would you expect the sky to turn to a      LIGHTER  or DARKER  shade of blue?

Explanation / Answer

1. d. 1900s

Teisserenc de Bort discovered the Stratosphere in 1900 with unmanned baloons. Below Stratosphere lies Troposphere but Mesosphere lies above it. Interface of Stratosphere with Troposphere is Tropopause and Stratosphere with Mesosphere interface is Stratopause.

2. d. all of the above.

Temperature decreases with altitude in Troposphere. Then again increases with altitude in Stratosphere. In Mesosphere, temperature again decreases with altitude and in the Thermosphere, temperature again increases with altitude. But temperature remains constant upto some height starting from the Tropopause, Stratopause and Mesopause i.e. near the base of Stratosphere, Mesosphere and Thermosphere respectively. Of these most pronounced is seen at the base of Stratosphere upto 9 km from its base.

3. Anvil refers to the top flat portion of a thunderstorm.
It is a cumulonimbus cloud and also called Cumulonimbus incus cloud which has an anvil top.

4. As you travel upeard in atmosphere sky turn to a darker shade of blue.

Due to oxygen and nitrogen molecules in atmosphere, the blue light is being scattered. This is Rayleigh scattering and due to this sky looks blue in colour. With increasing altitude the atmosphere becomes too thin to scatter the blue light of the visible portion of the electromagnetic spectrum. So colour of sky turn to a darker shade of blue.