[DOC] [TLE] Evolution of the Atmosphere [PAR] For the Early Earth, extreme volcanism occurred during differentiation, when 
massive heating and fluid-like motion in the mantle occurred. ... The gases 
emitted by volcanoes today are in Table 1 and in Figure. ... These organisms, 
blue-green algae (picture of... [DOC] [TLE] BBC - GCSE Bitesize: The early atmosphere [PAR] Scientists believe that the Earth was formed about 4.5 billion years ago. Its early 
atmosphere was probably formed from the gases given out by volcanoes. [DOC] [TLE] Origin of the Earth's Atmosphere - eiu.edu [PAR] Atmosphere - early atmosphere probably completely different in composition ... (
figure and table from Lutgens and Tarbuck, The Atmosphere, 8th edition). First 
Atmosphere. Composition - Probably H2, He; These gases are relatively rare on 
Earth ... Ocean Formation - As the Earth cooled, H2O produced by out gassing 
could... [DOC] [TLE] Early Atmosphere and Oceans | CK-12 Foundation [PAR] Feb 24, 2012 ... How Earth's atmosphere and oceans formed. ... Most of these gases were drawn 
into the center of the solar nebula to form the Sun. ... Scientists have calculated 
that the amount of gas that collected to form ... When photosynthesis evolved and 
spread around the planet, oxygen was released in abundance. [DOC] [TLE] The Origin of Oxygen in Earth's Atmosphere - Scientific American [PAR] Aug 19, 2009 ... These ancient organismsand their "extremophile" descendants ... of Earth's 
atmosphere, according to a 2000 paper in Science. ... "What it looks like is that 
oxygen was first produced somewhere ... Yet no one has come up with a rock-
solid test to determine the precise oxygen content of the atmosphere at... [DOC] [TLE] Earth's Early Atmosphere - Universe Today [PAR] The atmosphere of Titan, similar to the Earth's early atmosphere. ... the ammonia 
molecules released by volcanos, releasing nitrogen into the atmosphere. ... years 
ago that really changed the early Earth atmosphere into the one we know today. 
During the period 2.7 to 2.2 billion years ago, these early bacteria  known as... [DOC] [TLE] Setting the Stage for Life: Scientists Make Key Discovery About the ... [PAR] Nov 30, 2011 ... For decades, scientists believed that the atmosphere of early Earth was ... Now, 
scientists at Rensselaer are turning these atmospheric ... The findings rest on the 
widely held theory that Earth's atmosphere was formed by gases released from ... 
The scientists sought to determine the oxidation levels of the... [DOC] [TLE] Earth's Secondary Atmosphere - Windows to the Universe [PAR] These gases come from the melting of the Earth's crust at subterranian depths. ... 
scientists figure out what salt may have been part of the Earth's early oceans. [DOC] [TLE] Edexcel GCSE Science Revision Guide - Foundation [PAR] (b) State where scientists think these gases came from. (1 mark). 2. Describe ... 
tell us different things. The Earth's first atmosphere was formed by gases 
produced from volcanoes. ... difficult to know exactly what the early atmosphere 
was like... [DOC] [TLE] Earth's Earliest Atmospheres - NCBI - National Institutes of Health [PAR] Here we discuss the origin of Earth's atmosphere and ocean and some of the 
environmental ... These experiments were very influential in directing the 
attention of prebiotic ..... to find that CH4, H2, H2O, N2, and NH3 are the major 
gases produced by heating ..... Earth Planetary Science Letters 195: 7590; 
Canup RM 2004. [DOC] [TLE] Earth's First Atmosphere Contained What Gases? | The Classroom ... [PAR] Scientists studying the origin of life are interested in the composition of Earth's ... 
The atmosphere of the early Earth was very different from what we see today. ... 
decide what these clues can tell them about the our planet's early atmosphere. ... 
also produced significant amounts of methane, another potent greenhouse gas,... [DOC] [TLE] Atmosphere of Earth - Wikipedia [PAR] The atmosphere of Earth is the layer of gases, commonly known as air, that 
surrounds the ... Early pioneers in the field include Lon Teisserenc de Bort and 
Richard .... These are the highest clouds in the atmosphere and may be visible

Question: Scientists figure the earliest atmosphere on Earth was from gases emitted by these
Answer: Volcanoes