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

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Timed ! in which of these statements are protons, electrons, and neutrons correctly compared? quarks are present in protons and neutrons but not in electrons. quarks are present in protons, neutrons, and electrons. quarks are present in neutrons and electrons but not in protons. quarks are present in protons and electrons but not in neutrons.