A gas has more free molecules, and it is air, not a tangible substance. Hope it helps! :)
Allelopathy, the pine needles make the ground more acidic so weeds cannot grow and steal nutrients the tree needs
In CONVECTION, heat energy is carried by the movement of particles of matter. In CONDUCTION, heat is transferred by particles vibrating. In RADIATION, heat is carried directly by electromagnetic waves. When a hot object touches a cool object, heat moves from the hot one to the cool one.
The answer is D Transfer of heat through the movement of particles.
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