Difference between sea and lake
Sea vs lake:
Earth is 70.9% covered with water and about 96.7% of it found on earth is salt water while only 2.5% of water is freshwater that is found in lakes, rivers, ponds and other visible sources. While ocean water cannot be used for drinking and other purposes, it is this 2.5% that human beings are forced to use in their day to day activities for drinking and cleaning purposes. Sea and lake are two bodies of water which are essential forms of maintaining life on the planet. However, in order to understand the purposes of the sea and lake better, it is necessary to know the difference between a sea and a lake first.
What is a sea?
A sea is can be defined as a body of salt water of second rank, more or less landlocked and therefore a much smaller body of water that is somewhat internally locked in to the land. Sea beds are rich with both plant and animal life and many civilizations were known to have established themselves near seas such as the Mediterranean, the Aegean or the Caspian Sea which have indeed become cultural landmarks in the history of the mankind.
What is a lake?
A lake is usually an immobile body of inland water, surrounded by land and is characterized by ripples caused in the water by the wind which appears to be quite artificial. They are at least 2 to 5 hectares in size and can be either naturally made or man-made, thus developed for irrational purposes. The body of water is usually moderate to big in size with the water surface being exposed towards the atmosphere.
What is the difference between lake and sea?
The main difference between a lake and a sea would be the fact that while seas contain salt water, lakes are freshwater bodies. However, some sea can be found which contain freshwater but that indeed is a rare instance. It happens as a result of the sea being cut off by the ocean and then feeding off rivers and other freshwater sources that the salinity in the water goes down and they eventually turn to freshwater sources as well. The Black sea is one such instance where its body of water had alternated between salt water and fresh water over a geological time scale.
Due to the above factors, the concept of a sea and a lake has been known to confuse people from quite a time as the Dead sea and the Caspian sea although known as seas are sometimes referred to as lakes as well while the Caspian sea, despite its large size was referred to as a lake because of the fact that it was covered by land by all the sides. This fact of being covered by land on all sides is an essential characteristic that gives a lake its identity. However, it is generally believed that while a lake is covered by land on all sides, a sea is generally landlocked with a sufficient area of its boundaries being exposed to the ocean, thus giving it the chance to maintain its ties with the saltwater body, thereby maintaining the salinity in the water as a result.
Another fact which distinguishes a lake from a sea is the fact that while seas are more permanent bodies of water, lakes tend to die down from time to time. This occurs due to the lakes being dried out due to extremely hot weather and other such reasons which result in the water being replaced by soil and etc. Seas on the other hand are always connected to the ocean and are constantly nourished by the rivers, therefore, never lacking in water. Lakes are mostly man-made whereas seas are natural sources which have made themselves over time. While seas are considered to be much larger and deeper than lakes, there are some seas that are known to be much smaller and shallower than lakes as well. Therefore, distinguishing a lake from a sea remains still, an ambiguous task.
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