What is the relationship between changes in air pressure and wind speeds? When a high- and low-pressure air mass is far apart, air moves quickly from low to high pressure. When a high- and low-pressure air mass is far apart, air moves slowly from high to low pressure. When a high- and low-pressure air mass is far apart, air moves quickly from high to low pressure. When a high- and a low-pressure air mass are close together, air moves slowly from high to low pressure.

Mantle convection is the process that drives plate tectonics. the theory of plate tectonics states that the crust is divided into plates that float on the semi molten mantle below. the circular motion of the magma as it slowly rises and falls or move though convection cells drags the plates along causing them to move. the heat source in the lamp would represent the earth's core. the core is the source of energy that drives convection in the mantle. the lava represents molten magma under the earth's surface. if the lava lamp had floating pieces they would move as the circular motion of the lava in the lamp as it rises and falls would move them along the surface. these floating pieces would represent pieces of the earth's crust. 

Answer after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;