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.
The difference between a sea and a lake largely comes down to permanence. A sea is a more permanent feature, while a lake is relatively temporary. This time frame is relative, and should be examined on a scale of millions of years. On a geological scale that includes and measures other massive, slow events such as ice ages and plate shifts, a lake is a temporary feature.