a. The rock cycle is the only mass-transfer cycle on the Earth. b. A biogeochemical cycle involves only physical components. c. The carbon cycle is an example of a purely geochemical cycle. d. The hydrologic cycle involves reservoirs above, below, and at the Earth's surface.

D

Explanation:

The hydrologic cycle also known as the water cycle involves the movement of water between the reservoirs above (atmosphere), below (underground) and at the earth's surface

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Explanation:

because the two particles have an equal charge, the charges will cancel out and give the atom an overall charge of 0. so, if at atom has 35 protons in the nucleus, we could expect it to have 35 electrons orbiting that nucleus.