How does Earth's atmosphere compare to the atmospheres of Mars and Venus?

Answer 1

Okay first of all mars does not have life 2ndly mars is the 4th planet earth is the 3rd planet mars is mostly red and earth is mostly blue there is some but there are alot more

The difference between them is that Earth is larger and Mars does not have qualities for life to sprout.

71% of Earth's surface is water. Mars has no liquid water, but the Phoenix Mars Lander scooped up soil and ice.

Mars gravity is 2.7 times less than that of Earth. Mars has 2 moons and it's atmosphere is 95% CO2 with a tiny bit of nitrogen, argon, oxygen, and carbon monoxide.

Earth has 1 moon and has a lot of nitrogen and some oxygen and others (tiny bits of argon and carbon dioxide).

(Also, our deserts are hot in the daytime and cold at night. Mars's deserts are freezing and airless.)

The biggest difference is that Earth has advanced life forms, Mars does not.

Mars is smaller than earth with less gravity. It also has a very thin CO2 atmosphere where Earth has a Nitrogen Oxygen atmosphere that is much thicker. Mars is also very cold while Earth is warm.

* Earth is almost twice the diameter of Mars.

• Nearly 70% of Earth's surface is liquid water, while Mars has none.
• The sun warms the Earth to more the 100oF; on Mars the temperature barely goes above the freezing mark.
• Earth has an atmosphere breathable by humans. Mars has virtually none, and it is composed almost entirely of toxic gases.

  IIRC, Mars is about 1 1/2 time farther from the sun than Earth; and is about 1/2 the size, and 3/4 the density.

  It's surface is largely iron oxide, which gives it its reddish color. There is no liquid water (there is ice at the poles). Because is it has a much thinner atmosphere, and is farther from the sun, it is much colder.

  Astronmers speculate that Mars was once much closer to the sun and was more "earthlike," but gradually moved farther away, resulting in its present state.

Answer 2

The Earth's atmosphere is a complex collection of gases, mixed with water vapor, that provide the requisite conditions for living things. Earth's animal and plant life would have little chance for survival in the atmosphere of Mars or Venus. Mars' atmosphere is both shallow and thin, less than 1% as dense as Earth's. Even if liquid water were present (which it is not), the atmosphere cannot hold any appreciable water vapor. Much of Mars' oxygen is locked into surface rocks, and the remainder is combined as carbon dioxide. While CO2 makes up 95% of the Martian atmosphere, the low pressure means insufficient concentrations to support Earth vegetation. And while Martian temperatures may reach 20°C (68°F) in the Martian summer, it can also be as low as -140°C (-220° F). The atmosphere is highly inefficient at heat transfer. Venus is the other extreme of conditions. While Mars' atmosphere is cold and rarified, Venus' is hot and dense. The same net result is the absence of liquid water or vapor transport. Also the same is the predominance of carbon dioxide, with much less nitrogen than Earth. The temperature and pressure of Venus are much greater than Earth : the surface pressure is 92 times as great, and temperatures average 460°C (770° F). The atmospere is highly efficient at heat transfer, so there are few places on the surface more than a few degrees cooler. The only "rain" is droplets of sulfuric acid in high Venusian clouds of sulfur dioxide.

Answer 3

The Earth is the only planet in our solar system and the entire universe that is known to support life within its atmosphere. Our atmosphere is made up of nitrogen, oxygen, carbon dioxide and argon. Other planets atmospheres are made up of different elements and compounds, Neptune, for example has an atmosphere of hydrogen, helium and traces of hydrocarbons; nitrogen is also thought to be on Neptune as well.Earth is the third planet from the sun at 150 000 000km away, in front of earth are Venus at 108 000 000km away and then Mercury 57 900 000km away. Earth has only one moon; whereas other planets have multiple moons except Mercury and Venus which have no moons.

Answer 4

1. They both are inner planets.

2. They both have a rocky surface.

Answer 5

The size, mass and force of gravity.

Answer 6

earth and mars.....