1. Matter changes state because of temperature and pressure
http://wiki.answers.com/Q/What_causes_matter_to_change_states
2. The substance's particles move faster eventually changing from a solid to a liquid
http://wiki.answers.com/Q/What_happens_to_the_particles_of_a_solid_as_the_thermal_energy_of_the_substance_increases
3. The temperature of the matter remain the same because when it gets cold the particles still jumble together making it warm
4. A solid melts because of fire or heat
http://wiki.answers.com/Q/What_causes_a_solid_to_melt
5. You poke holes in the potato skin because it's almost waterproof and if it burns or explodes you can't help it
http://wiki.answers.com/Q/Why_should_you_poke_holes_in_the_skin_of_a_potato_before_it_is_baked
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