An ocean current is a continuous movement of water in the ocean in some direction - this means that the water flows at a similar speed and direction despite the fact that it's not the same water - i.e. there is a water exchange in the current. The currents are caused by such factors as temperature and salinity of water.
<span>more mass and a shorter lifetime </span>
Perestroika called for the restructuring of many aspects of the Soviet Union, for example for the restructuring of the economy. It called, among others, for more openness in communication between the government and the people.
The relative humidity will increase and water will condense. The boundaries between warm, moist air and cold, dry air is where storms frequently occur. As air rises, it expands because there is less atmospheric pressure at higher altitudes. As air expands, it cools.