This is the pattern formed in a fluid when heating causes part of the fluid to rise and then cooling causes it to sink again. within earth's mantle they circulate heat and drive plate tectonic processes. within the atmosphere and oceans, they drive winds and weather patterns.

Atmospheric Pressure and Winds belts.

Explanation:

As the fluid is heated it rises as the molecules get energy on heating, similarly the particles cool when they are condensers at a certain temperature that causes them to sink a similar pattern is found in the atmosphere also. The light arises and heavier air falls as it's dense and hence sinks again. Similarly, the earth heating patterns that are derived from convection currents coming from the mantel are also derived from the tectonic processes from within the earth's interior. Within the atmosphere and oceans are also found the wind and pressure belts that rotate in the spherical motion and derive up and down from the equator of the earth. The poleward cool air and hot air from the equator are mixed and create turbulence in the upper atmosphere in the form of Jet steams and westerlies and easterlies that derive the weather patterns around the globe.

How many miles is each lap?