Question

define.
a. hemisphere.
b. hermoshere.
c. troposphere​

Answer 1

Answer:

1. A hemisphere is a half of the global of earth. In scientific terms, the earth can be separated into different hemisphere.
2. The thermosphere is a layer of earth's atmosphere. The thermosphere is directly above the mesosphere and below the exosphere.
3. The troposphere is the lowest layer of earth's atmosphere. Most of the mass of atmosphere is in the troposphere.

Explanation:

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Answer 2

$\star \: {\underline{\boxed{\sf{Hemisphere:}}}}$

$\leadsto$ When any circle is drawn around the Earth, it divides in into two equal halves or parts. These are termed as Hemispheres.

$\leadsto$ Hemispheres can be classified into four types:

• Northern Hemisphere.

• Southern Hemisphere.

• Eastern Hemisphere.

• Western Hemisphere.

$\star \: {\underline{\boxed{\sf{Thermosphere:}}}}$

$\leadsto$ Thermosphere is the atmospheric region which ranges from 85 to 500 km altitude which contains Ionosphere.

$\leadsto$ Thermosphere includes mainly three types of components:

• Atomic Oxygen.

• Atomic Nitrogen.

• Helium.

$\star \: {\underline{\boxed{\sf{Troposphere:}}}}$

$\leadsto$ Troposphere is the Earth's lowest layer of atmosphere. Maximum mass about 75 to 80% of atmosphere lies in it.

$\leadsto$ Troposphere contains mainly three components according to their ratios:

• Nitrogen. (78%)

• Oxygen. (21%)

• Argon, Carbon dioxide $\sf{Co_2,}$ Water vapours. (1%)