Ask the Chatbot Games & Quizzes ProCon History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture Money Videos
source
Directory
References
Discover
Close up of books. Stack of books, pile of books, literature, reading. Homepage 2010, arts and entertainment, history and society
12 Novels Considered the “Greatest Book Ever Written”
Iraqi Army Soldiers from the 9th Mechanized Division learning to operate and maintain M1A1 Abrams Main Battle Tanks at Besmaya Combat Training Center, Baghdad, Iraq, 2011. Military training. Iraq war. U.S. Army
8 Deadliest Wars of the 21st Century
Diverse elementary school children wearing school uniforms running outside of school. Boys girls
Pro and Con: School Uniforms
Rural Irish landscape, Sligo, Ireland.
Why Is Ireland Two Countries?
Woman tied to a ducking stool, a method of punishment by means of humiliation, beating, or death. (cucking stool)
8 Unusual Punishments Inflicted on Women Throughout History
Thumbnail for flags that look alike quiz Russia, Slovenia, Iceland, Norway
Flags That Look Alike
Thanksgiving Turkey with all the sides
Why Do We Eat Turkey on Thanksgiving?

source

atmospheric science

Learn about this topic in these articles:

evolution of Earth’s atmosphere

  • abundance of oxygen
    In evolution of the atmosphere: Processes

    …the atmosphere is termed a source for the gas. Depending on the question under consideration, it can make sense to speak in terms of either an ultimate source—the process that delivered a component of the volatile inventory to Earth—or an immediate source—the process that sustains the abundance of a component…

    Read More
  • abundance of oxygen
    In evolution of the atmosphere: Ultimate sources

    The material from which the solar system formed is often described as a gas cloud or, at a later stage, a solar nebula. The cloud was rich in volatiles (termed primordial gases) and must have been the ultimate source of the atoms in the…

    Read More