Formation of Oceans (Leaving Cert CASD): Quizzes
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10 questions from this quiz
How long ago did Earth form through the process of accretion?
How long ago did Earth form through the process of accretion?
4.6 billion years ago
What happens to gases in magma during volcanic outgassing?
What happens to gases in magma during volcanic outgassing?
Pressure decreases, gases are released
Which gas was released during volcanic outgassing that eventually formed oceans?
Which gas was released during volcanic outgassing that eventually formed oceans?
Water vapour
What evidence shows early Earth had no free oxygen?
What evidence shows early Earth had no free oxygen?
No red sedimentary rocks before 2 billion years ago
When did atmospheric oxygen levels reach the current 21%?
When did atmospheric oxygen levels reach the current 21%?
350 million years ago
What is the current composition of Earth's atmosphere?
What is the current composition of Earth's atmosphere?
78% nitrogen, 21% oxygen
What percentage of Earth's water is in the oceans?
What percentage of Earth's water is in the oceans?
97%
Which process transforms liquid water into water vapour using solar energy?
Which process transforms liquid water into water vapour using solar energy?
Evaporation
What is the residence time of chloride in ocean water?
What is the residence time of chloride in ocean water?
100 million years
Why aren't most lakes salty like oceans?
Why aren't most lakes salty like oceans?
Lakes are temporary with outflowing rivers