The Unknown Discoveries of Earth's Waters
by Tim Soko, age 13
It may be hard to believe that 71 percent of the Earth's surface is made up of oceans, seas, and other bodies of water. With this much water covering the Earth's surface, its not surprising that scientists are still unsure of what these waters hold.
The Earth's crust is made of Oceanic crust and Continental crust. Continental crust is lighter and forms the land masses on Earth, so it floats on top of the dense Oceanic crust. The oceans are what fill up the hollows between the continents. Seas are more shallower than oceans. They are formed when areas of continents are below sea level.
The ocean floor is made up of tiny skeletons, mud, shells, and volcanic dust. The earth is made up of tectonic plates. These plates collide into each other causing natural disasters like earthquakes and volcanoes.
In the ocean, animals are found up to depths of 300 feet. All the sea creatures ultimately depend on plankton for food. Some animals eat plankton directly while aquatic predators depend on the animals that feed on plankton for food. This process is known as the food chain.
The seas remain a mystery. While we might have some knowledge about these bodies of water, there is much that has yet to be discovered. The water sparks legends of mermaids and sea serpents that have influenced people for centuries. Scuba divers and scientists are still learning about the mysteries of the sea, its creatures and submerged cities and shipwrecks. Earths many bodies of water are constantly revealing new and exciting secrets.
[Source: The King Fisher Children Encyclopedia]