because its closest to earth
No, it does not. It is a very light weight gas.
About 99%. The atmosphere is pulled down by gravity, so almost all of it is in the lower layer of the troposphere. Above that, it gets extremely thin and gradually you transition to space in the exosphere.
Dust, water vapor etc are in troposphere. It is the closest layer.
50 percent of the gases that make up Earth's atmosphere are found below about 5.6 kilometers (3.5 miles) in altitude, which is roughly half of the total atmosphere's height. This portion of the atmosphere is known as the troposphere, where most weather phenomena and aircraft travel occur.
Troposphere is name of the layer. It contains 75 percent of the air.
troposphere
The troposphere
troposphere
There are a few layers to the atmosphere however the Troposphere is the largest part of the atmosphere containing 75% of its mass. However the Troposphere contains 99% of the water vapour on the planet as well as Earth's aerosols. It is also where all weather phenomenon will occur.
Troposphere.
troposphere
troposphere
Around 80 percent of the gas in Earth's atmosphere is located in the troposphere, the layer closest to the Earth's surface where weather events occur and most of the atmosphere's mass is concentrated.
troposphere
The majority of Earth's atmosphere mass is found in the troposphere because this is where air molecules are most densely packed due to the gravitational pull. As altitude increases, air pressure decreases, leading to a thinning of the atmosphere. The troposphere is the lowest layer of the atmosphere and contains various gases like nitrogen, oxygen, and water vapor that together make up 75 percent of the atmosphere's total mass.
80 percent of the gas in the atmosphere reside in the troposphere.
Gravity. It tends to pull air downward.