Multiple Choice
In a chemical reaction involving the decomposition of calcium carbonate (CaCO3), which gas is produced?
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7. Gases
The Ideal Gas Law
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Which process is believed to have contributed to Earth's oxygen-rich atmosphere according to atomic theory?
A
Combustion of organic matter
B
Volcanic eruptions releasing oxygen
C
Formation of ozone layer
D
Photosynthesis by early cyanobacteria
Verified step by step guidance1
Understand that the question is asking about the process that contributed to Earth's oxygen-rich atmosphere.
Recognize that photosynthesis is a process where organisms convert carbon dioxide and water into glucose and oxygen, using sunlight as energy.
Identify cyanobacteria as early photosynthetic organisms that played a crucial role in producing oxygen through photosynthesis.
Acknowledge that the oxygen produced by cyanobacteria accumulated in the atmosphere over time, leading to an oxygen-rich environment.
Conclude that photosynthesis by early cyanobacteria is the process believed to have significantly contributed to Earth's oxygen-rich atmosphere.
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