cold seep - A place where gases bubble up from the seabed., brine pool - A super-salty “lake” at the bottom of the ocean., methane - A gas that bacteria use to make food in the deep ocean., hydrogen sulfide - Gas with a rotten-egg smell., tube worms - Spindly, red-topped animals that live at cold seeps., mussels - Animals that huddle around brine pools and host bacteria., bacteria - Tiny organisms that make food from chemicals instead of sunlight., chemosynthesis - The process where bacteria make food using chemicals, not sunlight., seabed - The very bottom of the ocean floor., submersible - A small underwater vehicle used to explore the deep sea., darkness - What it’s like where cold seeps and brine pools are found., salty water - Four to five times stronger than seawater inside a brine pool., fizzing bubbles - What you see when gases escape from a cold seep., low spot - Where salty water settles to form a brine pool., clusters - A group of bacteria or mussels packed tightly together., special organ - Inside tube worms, packed with bacteria that make food., silvery worms - Animals that live on methane ice in hollowed-out spots., seafloor - The surface at the bottom of the ocean where these features form., rotten eggs - The smell of hydrogen sulfide gas from cold seeps., extreme environment - What scientists call places like cold seeps and brine pools.,

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