Deep Sea Trivia: Life in the Ocean's Dark Zones

What is the name of the deepest known point of the ocean, in the Mariana Trench?

• Horizon Deep
• Sirena Deep
• Challenger Deep
• Brownson Deep

How is the ocean zone between roughly 4,000 and 6,000 metres of depth, in total darkness, called?

• The photic zone
• The abyssal zone
• The bathyal zone
• The hadal zone

What is the ability of many deep-sea animals to produce their own light called?

• Photosynthesis
• Fluorescence
• Iridescence
• Bioluminescence