Theory:

In day-to-day life, so many changes are taking place across many things around us. Some of these changes may occur in a minute or in a year, and few of them can be unnoticeable.
Let us now see about the slow and fast change with few examples.
Slow changes:
Slow changes occur over a prolonged period of time. i.e. over days, months, or years.
 
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Rusting of iron nails
  
1Rusting is a slow chemical process where it takes at least four to six weeks for an iron object to turn into rust.
 
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 Drying of fish
  
2. Drying of fish takes place in the presence of heat or sunlight. It takes more than two weeks time for a fish to dry up completely.

Therefore, when the time taken for a change to occur is more, it is known as slow change.
    Example:
  • Nail and hair growth
  • Seasonal changes
  • Seed germination
  • Ageing
  • Ripening of fruits
  • Day turns to night
  • Growing crops in the agricultural field
  • Falling leaves from trees
  • Booming of flowers
  • Rusting of iron nails and so on
Fast changes:
Fast changes are defined as those that occur in a short period of time (seconds or minutes). However, many changes are occurring in the human body every minute.
 
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Bursting a balloon
  
1. Bursting a balloon is a fast and spontaneous process that takes less than a few seconds to burst by producing sound.
 
Therefore, when the time taken for a change to occur is less, it is known as fast change.
    Example:
  • Bursting a balloon
  • Breaking a window
  • Burning paper
  • The spinning of a top
  • Earthquakes
  • Volcano eruption
  • Floods
  • Landslides
  • Drying hair with a hairdryer and so on.