Which of the following is the best definition of radiation?

a.
the movement of energy from one substance to another by direct contact

b.
the movement of a hot liquid of gas from one place to another, carrying energy with it

c.
the movement of energy in gas particles

d.
the movement of energy by waves that travel through space

D.  the movement of energy by waves that travel through space

Explanation:

There are three modes of heat transfer:

1. Conduction: This type of heat transfer happens when there is direct contact between the two object.

2.  Convection: his type of heat transfer happens when there is a movement of fluid (liquid or gas) in which convection currents are produced due to the movement of hot fluid upwards and cold fluid downwards. This happens as the density of hot fluid decreases and thus it moves upwards.

3. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.