thermal conductivity is a property describing the material’s ability to conduct heat and is not dependent on the amount of material present.

Explanation:

Thermal conductivity is a physical property of materials that enable heat transmission. This means that when a body has thermal conductivity, heat passes from the body of higher temperature to another of lower temperature that is in direct contact with it.

In other words:

This property implies the ability of a material or substance to transfer the kinetic energy of its molecules to adjacent ones or to other materials (or substances) with which it is in contact.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide