Question

1. The atmosphere of Venus is 90 times more massive (based on the surface pressure) than Earth, yet Mercury has almost no atmosphere. Explain why the atmospheres of these two planets are so different. Use at least three factors we discussed in class to explain the differences (gravity, surface temperature, composition). Don't be vague - be specific - which will require you to do some research into the characteristics of each planets' atmosphere. (6)

Answer 1

& The atmospheres of Venus, Mercury as well as Earth so different beff because of the followings factors - surface gravity suntace temperature and the composition of those planent. Venus :- As we know venus and Earth are almo- st the same size and same mass, so the gravity on Venus is almost same as like gravity on Earth According to the planetary researchers the surface gravity on the venus is about al percep percentage of the surface gravity on the Earth, so any person or object is weight about 100 pounds on Earth's surface they o would weight about 91 pounds on Venus surface the surface temperature of Venus is so high about 463 degrees Celsius because Venus atmosphere of venus traps much of the incoming solar energy and venus is surrounded by a very thick atmosphere that is about 100 times greater than the atmosphere of Earth the atmospheric composition of lenus is mostly carbon dioxide alsout 96%, Nitro- gen about only 3 %, this con in the atmosphere of venus acts as a greahouse

trapping the heat from the incoming sun - light and make hottest planet in our Solar system, while the internal core is made up of iron core and arocky -mantle as like to the composition of Earth. Mercury :- As we know mercury is small planet it has less mars and size as compare to Venus or Earth and due to this charectristic I the force of gravity is very less, the surface gravity on Mercury is only about 138 1. of the gravity on Earth, so any person or object is weight about 100 pounds. on Earth's surface, they would weight I about 38 pounds on Mercury The sunface temperature on Mercury varies from day and night. During day I time, the surface temperature on Mercury can reach about 430 degrees Mercury has no celsius and because atmosphere to retain that heat from the slen, so in the night time, the

Surface temperatures on Mercury can drop to minus 180 degrees Celsius- - Murcury is also the closest planet to the sun. - the atmospheric composition of the - Mercury varies it contain small amount of hydrogen, helium and exgygen, it also has some small amount of sodium, calcium, potassium gases, Marcury in has extremely thin atmosphere and thinnest in solar system Mercury has a solid silicate crust or surt-ace while it has iron rich interior,
Above are the short comparison between venus and Mercury in terms of gravity, surface temperature and composition.