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www.reference.com/science/up-earth-s-atmosphere-d72e11cb6164181

About 78 percent of the Earth's atmosphere consists of nitrogen, and oxygen makes up 21 percent. The remaining 1 percent is a combination of argon, water, carbon dioxide and other gases. The Earth's atmosphere is the only atmosphere in the solar system where there is plentiful free oxygen.

www.space.com/17683-earth-atmosphere.html

Earth is the only planet in the solar system with an atmosphere that can sustain life. The blanket of gases not only contains the air that we breathe but also protects us from the blasts of heat ...

en.wikipedia.org/wiki/Atmosphere_of_Earth

The thermosphere is the second-highest layer of Earth's atmosphere. It extends from the mesopause (which separates it from the mesosphere) at an altitude of about 80 km (50 mi; 260,000 ft) up to the thermopause at an altitude range of 500–1000 km (310–620 mi

www.scienceterrific.com/atmosphere_composition.php

There are many things in the atmosphere, but basically it is made up of two different elements which are gases. Measured by volume (not weight) completely dry air contains approximately 78% nitrogen and 21% oxygen with about 1% of everything else. The extra 1% or so of total air content consists of many different things.

sciencing.com/elements-makeup-earths-atmosphere-6851571.html

The Earth's atmosphere is a relatively thin blanket of gasses surrounding the planet's surface, averaging a thickness of only seven miles. It is divided into four layers: the troposphere, stratosphere, mesosphere and thermosphere. These layers contain a number of gasses, two in abundance and several others in minuscule amounts.

www.reference.com/science/gases-make-up-earth-s-atmosphere-59cbd4b721d8d090

The Earth's atmosphere is primarily made up of nitrogen, oxygen and argon, but it includes trace gases in smaller amounts such as neon, helium, carbon dioxide, methane, nitrous oxide and ozone. The most abundant gases in the atmosphere are nitrogen at 78 percent and oxygen at 21 percent, while the trace gases methane, neon and helium make up ...

en.wikipedia.org/wiki/Atmosphere

An atmosphere (from Ancient Greek ἀτμός (atmos), meaning 'vapour', and σφαῖρα (sphaira), meaning 'ball' or 'sphere') is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is...

simple.wikipedia.org/wiki/Atmosphere_of_Earth

The atmosphere is the layer of gases around the Earth.It is held in place by Earth's gravity.It is made up mainly of nitrogen (78.1%). It also has plentiful oxygen (20.9%) and small amounts of argon (0.9%), carbon dioxide (~ 0.035%), water vapor, and other gases.The atmosphere protects life on Earth by absorbing (taking) ultraviolet rays from the sun.It makes our days cooler and our nights war...

www.nasa.gov/mission_pages/sunearth/science/atmosphere-layers2.html

The ionosphere is a critical link in the chain of Sun-Earth interactions. This region is what makes radio communications possible. Exosphere This is the upper limit of our atmosphere. It extends from the top of the thermosphere up to 10,000 km (6,200 mi). Credit: NASA/Goddard

scied.ucar.edu/shortcontent/earths-atmosphere

Gases in Earth's Atmosphere. Nitrogen and oxygen are by far the most common; dry air is composed of about 78% nitrogen (N 2) and about 21% oxygen (O 2). Argon, carbon dioxide (CO 2), and many other gases are also present in much lower amounts; each makes up less than 1% of the atmosphere's mixture of gases. The atmosphere also includes water vapor.