The annual health-care costs for people who are extremely obese are almost twice those of normal-weight people. Very sobering is the fact that severe obesity is increasing at a much faster rate than moderate obesity, quadrupling from 1986â2000.6.
As a sea is connected to the oceans, which are salt water, most seas are also salt water. This is not a distinguishing feature between a sea and a lake, however, as lakes are more commonly freshwater but can be salty depending on their source and their surroundings.
Key Difference: Oceans are large bodies of water that exist on the Earth. Oceans and seas are both bodies of water and these terms are often used interchangeably due to their lack of proper definition. Water bodies make up the hydrosphere that covers 71% of the Earth. Oceans and seas have slight differences among them.