Convection in the troposphere causes •wind •ocean currents •both wind and ocean currents •neither wind nor ocean

Explanation : The uneven heating of the regions of the troposphere by the sun ( the sun warms the air at the equator more than the air at the poles ) causes convection currents, large-scale patterns of winds that move heat and moisture around the globe. As air rises, expands, and cools, water vapor condenses and clouds develop.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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