English National Curriculum - Science
Mission Objectives
Describe how the Earth's oceans were formed
Explain how oxygen increased in the Earth's atmosphere
Explain how carbon dioxide decreased in the Earth's atmosphere
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Words and meanings to learn
carbon dioxide (CO₂)
made up a large proportion of the early atmosphere, released by volcanic eruptions and responsible for contributing to the greenhouse effect
photosynthesis
process by which green plants and some microorganisms use sunlight to convert carbon dioxide and water into glucose and oxygen
oxygen (O₂)
a reactive gas in the atmosphere essential for respiration and combustion
calcium carbonate
a compound formed when carbon dioxide dissolves in water and reacts with calcium ions; used by marine organisms to make shells and skeletons
cyanobacteria
photosynthetic microorganisms (also called blue-green algae) that were among the first organisms to produce oxygen on Earth
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