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: Tides are the rise and fall of sea level that is caused by the gravitational pull of the moon and the sun on the Earth. Tides and Waves are two types of natural phenomena that occur on water and are similar in nature; hence a lot of people can confuse the terms to mean the same thing. Though, both of these are related to bodies of water, such as oceans and seas, they differ from each other.