Nitrogen accounts for most of the Earth's atmosphere in volume. Oxygen ranks second. Together, nitrogen and oxygen compose 99 percent of the atmosphere's volume, with trace elements such as argon making up the rest. More »

Nitrogen is the most abundant element, comprising about 78% of the earth's atmosphere. Oxygen is the second most common element, at 21%, followed by argon at 0.9%. These three gases - nitrogen, oxygen and argon - are kno... More »

www.reference.com Science Earth Science Atmosphere

According to NASA, the moon does have an atmosphere. Although the moon’s atmosphere is minimal in comparison to Earth’s – less than 1 million molecules in 1 cubic centimeter of moon air versus 10 quintillion molecules in... More »

www.reference.com Science Astronomy Our Moon

Nitrogen is the most abundant element, comprising about 78% of the earth's atmosphere. Oxygen is the second most common element, at 21%, followed by argon at 0.9%. These three gases - nitrogen, oxygen and argon - are kno... More »

www.reference.com Science Earth Science Atmosphere

According to the University of Michigan, the primitive Earth did not have an atmosphere until gases were released from the planet's interior. Fast-moving gases and massive volcanic eruptions led to the creation of two di... More »

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 onl... More »

Wind is created by the uneven heating of Earth's surface and atmosphere. Different substances on the planetary surface absorb solar radiation at different rates. Warmer air expands to create a pressure difference that pr... More »