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Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today. A. hydrogen B. oxygen C. lead D. ore
A. hydrogen
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User: Ancient cyanobacteria released ______, which assisted in creating the atmosphere as we know it today. A. hydrogen B. oxygen C. lead D. ore

Weegy: A. hydrogen
nairos|Points 200|

User: The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates

Weegy: The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates c. Acid rain
hersheys|Points 284|

User: Geologists have divided Earth's history into time units, which are largely based on

User: Geologists have divided Earth's history into time units, which are largely based on A. oral histories. B. fossils. C. climates. D. written correspondences

Weegy: Geologists have divided Earth's history into time units, which are largely based on fossils. [ ]
wisbest|Points 2751|

User: A natural resource that is mined for profit is called

User: What is the oldest and most stable part of a continent

Weegy: Cratons are the oldest and most stable parts of the continental lithosphere and shields are the exposed area of a craton(s).
Expert answered|arcaisme|Points 10|



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Asked 8/9/2013 11:59:45 AM
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