1. Something changes state when it gets hotter or is heated up.
http://wiki.answers.com/Q/What_causes_matter_to_change_state
2. It causes the paritcles to move faster and after awhile it will become a liquid if it is a solid.
http://wiki.answers.com/Q/What_happens_to_the_particles_of_a_solid_as_the_thermal_energy_of_the_substance_increases
3. The tempature stays the same because all the tempature's energy is being put into the matter changing in its state. http://wiki.answers.com/Q/Why_does_the_temperature_of_matter_remain_the_same_while_the_matter_changes_state
4. When something gets hotter it begins to melt becuase all of the matter gets bigger causing making it melt away.
http://wiki.answers.com/Q/What_causes_a_solid_to_melt
5. It is mainly made from moisture so as it is heated up it begins to steam. If the steam doesn't have a way to get out then it will explode.
http://wiki.answers.com/Q/Why_should_you_poke_holes_in_a_potato_before_baking_it
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