I have tried many times without success to find out who is supplying Costco with it's gasoline. In our area it is delivered by an independant fuel delivery service so unless you followed the truck you would not know where it is comming and going to. The supplier could also change from time to time based on bidding.
Oceans around the world are becoming degraded. Evidence shows that human activities, including intense fishing around the world, are altering ocean ecosystems beyond their natural state. According to numerous scientific studies, fish, shellfish, and other important species are declining in many places.
The Role of Wind. Surface ocean currents are mainly caused by wind. The winds that most affect the oceans' currents are: The Role of Density. Differences in water density affect vertical ocean currents (movement of surface ocean water to the bottom of the ocean and movement of deep ocean water to the surface). Variations in water density are caused by variations in salinity (the amount of salt in water) and temperature.