Fog is a cloud that has
a. a small vertical extent.
b. no ability to produce rain.
c. particles made of ice crystals.
d. its base at or near the ground.

The correct answer is D. Fog is a cloud that has its base at or near the ground.

Explanation:

Fog is understood in meteorology as a part of the atmosphere in which water droplets are finely distributed, and which is in contact with the ground, whereby the water droplets are formed by condensation of the water of the moist and supersaturated air. From a technical point of view, fog is an aerosol, but in the meteorological system it is counted among the hydrometeors.

they use tree rings to figure out weather patters.

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