Formation of Oceans (Leaving Cert CASD): Flashcards
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Practise the cards
10 cards from this deck
Accretion
Accretion
Dust & rocks sticking together to build early Earth
Outgassing
Outgassing
Gases released from magma as pressure decreases
Early Earth's free oxygen level
Early Earth's free oxygen level
Virtually none (no O₂)
Evidence of no early oxygen
Evidence of no early oxygen
No red sedimentary rocks before 2 billion yrs ago
Photosynthetic organisms' role
Photosynthetic organisms' role
Produced O₂ from CO₂ using sunlight
% of Earth's water in oceans
% of Earth's water in oceans
97%
Evaporation definition
Evaporation definition
Liquid water to vapour using solar energy
Precipitation definition
Precipitation definition
Water falling as rain or snow
Steady state in oceans
Steady state in oceans
Input rate equals removal rate
Residence time
Residence time
Avg. time substance stays in ocean before removal