Take a look at a globe, what do you see? A lot of blue that defines earth as an aquatic world. We know that water makes up over 70% of the surface of the earth, but the aquatic world that we live on is so much more special and amazing than we think. There are 2 different types of water that make up our aquatic world, so let’s take a little look at both.
When we are out fishing or diving in our fresh water lakes and rivers we assume that they make up a large part of the aquatic world, after all just look how big the Great Lakes are and the Nile River and the Mississippi River, they are huge; but all the fresh water in the world is less than the amount of water in the Indian Ocean basin. Just a scant 3% of all the water on this aquatic world is fresh with right at 75% of that frozen in polar ice caps and another 20% of all fresh water is in ground water.
There are 2 primary fresh water ecosystems. Lentic which are inland depressions with standing water formed by glacial erosion and depositions, rock and debris that block streams or earth movement that caused land to sink and flood. These systems are influenced by temperature which cause biological stratification and are divided into 4 zones. The second major system is the Lotic ecosystem that are the running waters of our rivers and streams. These environments are subject to constant change and demand a continuous supply of nutrients from land based sources.
The second source of water on our aquatic world is the oceans. When we look at the globe and all that blue we see different names and we think that there are different oceans. Actually it is all one big ocean, the names come from a time when we didn’t know much about the world and they are also an easy way to label different regions of the ocean.
There are also 2 zones in the ocean, the aphotic zone that is the zone of perpetual darkness and the photic zone or the zone where light can reach. As divers we also think that the ocean is a generally warm place but the average temp is a chilly 38 degrees and the temp ranges from 32 degrees to a balmy 98 in the Persian Gulf. The average depth of our ocean is approximately 2.4 miles and the world’s longest mountain range is found running from the Arctic Ocean through the Atlantic and past African and Asia to the Pacific and the west coast of North America, a little over 10,000 miles.
With the Pacific Ocean alone being 25% larger than all land masses it is easy to see what an important role the aquatic world place in our day-to-day being.
Happy diving! and feel free to leave a comment