SUMMARY:
a) What are the three different changes of state of water which require gain of heat?
b) What are the three factors that affect the rate of evaporation?
c) Give two ways we use boiling in our lives, two ways melting is helpful and two ways where we experience evaporation.

REFLECTION:
Our planet is experiencing climate change and global heating. Yet, we continue to enjoy a sufficient supply of clean, freshwater. How can we make sure that we will continue to have this supply in the future?

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please answer