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When energy is added to matter its temperature will rise. The temperature rise will depend on the mass which in turn depends on its density.

The particle model describes the arrangement of particles in solids, liquids and gases; it can be used to predict changes when matter is heated.

Forces are responsible for changing the motion of objects. If more than one force is present, the shape of an object can also be changed.

The Sun is our nearest star. It is a relatively small star when compared to other stars in the Universe. The Big Bang theory suggests how our Universe was created, the evidence for this is red-shift.