6th Grade · Science · Reading Passage · shared by Luke Morgan
Explore deep-sea hydrothermal vents & chemosynthesis with this 6th Grade Science reading passage about life without sunlight.
The Alien World of Black Smokers
Deep beneath the surface of the ocean, where sunlight never reaches, exists a world that seems like another planet. In this dark and freezing environment, scientists discovered amazing structures that are now commonly called hydrothermal vents . These vents are like underwater chimneys that spew out hot, mineral-rich water from deep inside the Earth. Some are known as "black smokers" because the water they release looks like thick clouds of dark smoke. Even though the water can reach 400 degrees Celsius, life manages to thrive in this very harsh place.
The water coming out of a hydrothermal vent is filled with dissolved metals and chemicals like hydrogen sulfide. When this superheated fluid hits the freezing ocean water, the minerals settle and build tall, rocky towers. These chimneys can grow quite high and provide a sturdy home for many unique and strange creatures. While most life on Earth depends on the sun for energy, these deep-sea communities exist in total darkness. Because there is no light, nature has developed a different and fascinating way to produce food.
The foundation of this strange ecosystem is a process called chemosynthesis , which is performed by tiny organisms. These microscopic life forms, known as microbes , act much like the plants of sunlit ecosystems. Instead of using sunlight, they use the energy stored in chemical bonds from the hot vent water. They take in harsh chemicals and turn them into nutrients that provide energy for many other animals. This incredible ability allows life to exist without any help from the sun shining far above.
These microbes are the primary producers that support a vast variety of larger animals living near the vents. Giant tube worms, which have no mouths, rely entirely on the…