On a particle level, what happens when thermal conduction occurs within a liquid?
a. when fast particles rise to the top.
b. when slow particles sink to the bottom.
c. when particles stop moving.
d. when the average speed of particles is the same throughout the liquid.

a) When fast particles rise to the top.

Explanation:

Heat is a form of energy that can be studied through the thermal agitation of the molecules that a material involves. When heat is delivered to a body, its temperature increases, the mobility of its molecules increases. In this way, the system is not in thermal equilibrium: the temperature at each point of the body is different and the variations over time.

There are three forms of heat transmission: conduction, convection and radiation. In conduction, heat is transferred only because of molecular movement and shocks between fast and slow molecules, without displacement of matter. Convection is due to the global movement of matter and is only important in liquids and gases. Radiation is an electromagnetic interaction between bodies and does not require the existence of a material means to transmit heat from one to another. The conduction of heat in a medium can be more or less favorable according to the material.

when the average speed of particles is the same throughout the liquid

Explanation:

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up