Exploring the Ocean's Depths

What percentage of Earth's oxygen is generated by life in the sea?

• About 50%

• About 70%

• About 80%

• About 60%

What is the average depth of the ocean?

• 2 km

• 4 km

• 6 km

• 8 km

Which creatures use their own light to illuminate the deep sea darkness?

• Sharks

• Jellies

• Whales

• Seahorses

What percentage of the ocean has yet to be seen by human eyes?

• About 65%

• About 75%

• About 95%

• About 85%

What has caused the decline of many large and small species of ocean creatures?

• Ocean Currents

• Industrial Fishing

• Climate Change

• Natural Predators

What are dead zones?

• Areas with no fish

• Areas with no water

• Areas with no sunlight

• Areas with no oxygen

How has the construction of coastal cities affected the ocean?

• Improved water quality

• Loss of mangrove forests

• Created new coral reefs

• Increased fish populations

What is causing the ocean to become more acidic?

• Sunlight

• Overfishing

• Climate Change

• Volcanic Eruptions

What discovery about the ocean is considered one of the great discoveries of our time?

• Its unexplored depths

• Its self-cleaning ability

• Its infinite resources

• Its limits to exploitation

What can we do to help reverse the troubling trends affecting the ocean?

• Continue polluting

• Treat the ocean as vital to our survival

• Ignore the problems

• Increase industrial fishing