U3L3

What percentage of Earth's surface is covered by salt water?

• 60%

• 71%

• 50%

• 85%

Which ocean is the largest and deepest ocean on Earth?

• Pacific Ocean

• Indian Ocean

• Arctic Ocean

• Atlantic Ocean

What is the name of the zone in the ocean where sunlight provides photosynthesis and creates almost half the oxygen released into the atmosphere of Earth?

• Midnight Zone

• Abyss

• Sunlit Zone

• Twilight Zone

What is the main cause of coral bleaching?

• Oil spills

• Pollution

• Overfishing

• Increased ocean temperature

What is the leading cause of sea level rise?

• Melting of ice cream

• Deforestation

• Water expansion under heat

• Volcanic eruptions

Which ocean zone is the deepest and practically inhospitable?

• Twilight Zone

• Midnight Zone

• The Trenches

• The Abyss

What is the name of the sea division enclosed or partly enclosed by land?

• Sea

• Sea level

• Lake

• Ocean

What is the main consequence of ocean acidification?

• Higher acid content in sea water

• Decreased storm frequency

• Increased coral growth

• Reduced sea levels

Which type of sea is similar to the open ocean specifically when it comes to water circulation?

• Surrounding seas

• Hypersaline lakes

• Partly-enclosed seas

• Nearly-enclosed seas

What do oceans act as by absorbing 90% of excess heat brought on by climate change and 23% of human-induced carbon dioxide emissions?

• Carbon emitters

• Carbon sinks and heat sinks

• Pollution absorbers

• Heat reflectors