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.
Lakes and ponds are standing bodies of water while rivers and streams are distinguished by a fast-moving current. While there appear to be clear distinctions, the differences become subtle in regions where rivers widen and current slows such that the river could be considered a lake or a pond.