At what point will the currents that transfer heat throughout a gas cease to flow? a. when the substance changes state and becomes a liquid b. when the entire gas is a single temperature c. when the substance is very hot on top and cold beneath d. when the particles stop bumping into each other

The correct answer is B.

Explanation:

If there is a temperature difference the heat will always travel from the hottest place to the coldest.

It is only when the gas mass reaches the same temperature that the heat stops flowing through it. As the temperature homogenizes, there is no need for heat transfer currents.

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luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

+15-35=-20

going in opposite directions