A(n) is a line that runs from the north pole to the south pole and connects points of equal longitude.

The Meridian

Explanation:

Its an imaginary line that runs from North to South pole and connects points of equal longitude, basically a line of longitude. Each meridian is perpendicular to all circles of latitude. Each of the same length and thus measuring 20,003.93 kilometers. The term median comes from the Spanish word of Midday. The concept was given by Eratosthenes, this meridian passes through the Greenwich Park, England and was called s the prime meridian set to zero degrees. As it was in the interest of nations to set up a time zone to benefit from fast-growing economic productivity. Unifications of the astronomical, nautical and civil days in one.Similarly, the magnetic median connects the north to south poles and has been taken as a horizontal line. Passing at an angle of 90 degrees from the equator to both the poles.

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. 

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