Convection currents, which affect weather and climate, are created by
A.
the uneven heating of the Earth.
B.
erosion of ocean beaches.
C.
slow, constant tectonic movement.
D.
mining of the seafloor.

A. the uneven heating of the Earth

Explanation: Convection currents are created by the uneven heating of the Earth.

Because the Earth is tilted on its axis, some areas receive more solar radiation than others. These areas become warmer, and warmed fluids (air and water) rise and expand outward toward the poles.

Heat is transferred from the warmed fluids to cooler fluids. As a result, the cooler fluids become warmer and rise, and the warmer fluids cool and sink.  The circular flow pattern that results is called a convection current.

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explanation:

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

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