Why solid melt when heated

When a solid is heated the particles gain energy and start to vibrate faster and faster. Further heating provides more energy until the particles start to break free of the structure. Although the particles are still loosely connected they are able to move around. At this point the solid is melting to form a liquid.

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as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.