Question

Drag the tiles to the boxes to form correct pairs.

As our current atmosphere formed, the concentrations of various atmospheric gases fluctuated. Match each gas with the explanation that best describes how its proportion changed during the evolution of the atmosphere.











hydrogen





ammonia





water vapor





oxygen





carbon dioxide





Proportions decreased as it reacted with other elements to form nitrogen.



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Proportions increased as this gas was released through volcanic eruptions.



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Proportions decreased as this lighter gas was blown away by solar winds.



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Proportions increased as plants released this gas into the atmosphere.



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Proportions decreased as plants used this gas during photosynthesis.



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Answer 1

Hydrogen - Proportions decreased as this lighter gas was blown away by solar winds.

Water vapor - Proportions increased as this gas was released through volcanic eruptions.

see image for the rest

Answer 2

Oxygen - Proportions increased as plants released this gas into the atmosphere.

Water Vapor - Proportions decreased as this lighter gas was blown away by solar winds.

Hydrogen - Proportions increased as this gas was released through volcanic eruptions.

Ammonia - Proportions decreased as it reacted with other elements to form nitrogen.

Carbon Dioxide - Proportions decreases as plants used this gas during photosynthesis.