Ocean Treasure
As economies grow, more goods are manufactured, so there is a constant need for metals. Changes in technology have further increased this demand. For example, computers and smartphones require rare metals such as gold. The amount of metal available on land, however, is limited. It is expensive for mining companies to dig deep into the ground to find metals. For these reasons, mining companies are now looking for metals under the sea.
In the past, finding metals under the sea was considered to be too much
of a challenge.
In the last few decades, however, places where rare metals
can be found have been discovered. These places are called “hydrothermal sea vents.” They are created when seawater flows deep inside the earth, where the rocks are very hot. The rocks are made of substances that contain metals. The water absorbs these substances. As the water gets hotter, it rises, pushes through the seafloor, and returns to the ocean.
When the hot water mixes with the cold seawater, the substances in it
are dropped on the seafloor.
Because they are deep in the ocean, hydrothermal sea vents were not discovered until the 1970s. Scientists are interested in them not only because of the metals they contain, but also because of the amazing creatures found living near them. The water around the vents is very hot, dark, and full of powerful acids. In spite of these difficult conditions, bacteria and animals have adapted to live in these places. Unlike almost all other living things on the planet, these special creatures do not depend on energy from the sun.
The conditions around the vents mean that mining near them is very challenging. The technology to mine close to the vents now exists, but it is still very expensive. There are other problems with deepsea mining, too. Scientists believe that sometime soon, companies will be able to afford to mine metals from the seafloor. However, mining around the vents would probably harm the creatures that live there. Consequently, although mining the seafloor for metals will become possible, governments
and environmental groups might fight against it and perhaps even try to ban it. |