Hydrothermal vents deep in the ocean release extremely hot water, methane gas, and sulfur. Extreme bacteria thrive in this hostile environment. They form the base of a food web - that includes tube worms, mussels, and many other life forms. When a hydrothermal vent becomes inactive and cold, what will like occur?

They become inactive when seafloor-spreading moves them away from the rising magma or when they become clogged. Some vent fields may remain active for 10,000 years, but individual vents are much shorter-lived. Chemosynthetic bacteria obtain energy from the chemical bonds of hydrogen sulfide.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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