Answer:
The correct statement for comet is - ( a ) They have highly elliptical orbits around the sun
Explanation:
The comet is made up by the composition of dust , water , ice , rock and frozen gases like , the carbon dioxide , methane , ammonia and carbon monoxide .
Comet shows a process called outgassing , i.e. , the comet passes close to the sun , then they start to release gases , which is visible in the form of a comet's tail .
The comet and its tail glows by the sun and becomes visible when the comet passes through the solar system , because the dust partials reflects sunlight directly and the gas glows due to ionization process.
The orbital of comet is usually highly eccentric elliptical path .
Answer:
Mesosphere lies in between 50 to 80 km above the earth surface and due to low density gases escape easily and hence it is colder.
Explanation:
Mesosphere has the capacity to not absorb the infrared radiation that's why the gases reflected from the earth surface escape the layer of mesopause and goes inside the thermosphere.
In the thermosphere, even the minute atoms of gases ca be absorbed by the layer which increases the air temperature and the air rises up hence making thermosphere as the hottest layer in the atmosphere.
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Simon Bolivar's revolution brought an end to the Spanish rule in South America.
