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Answer:
4.a) freezing
b) boiling
5.This is so because it can be used to separate even smaller solid particles, which may not completely settle down with sedimentation. At the same time, during decantation, there is a chance of the particles mixing back in the liquid. ... Thus, filtration is better than sedimentation and decantation.
6.The more larger particles are present, the faster is the closure of pores through which smaller particles can pass — and the fewer overall filter penetrations. The earlier filtration is terminated, the lesser the amount of throughput.
7.Water purification also meets the needs of medical, pharmacological, chemical, and industrial applications for clean and potable water. The purification procedure reduces the concentration of contaminants such as suspended particles, parasites, bacteria, algae, viruses, and fungi.
8.Advantages of friction:
Friction enables us to walk freely.
It helps to support ladder against wall.
It becomes possible to transfer one form of energy to another.