The diagram below shows an electric circuit where point A and B are unmm and use it to answer question 20 and 21

Here are the answers to the questions:

20. When points A and B (bare wires) get in contact, a short circuit occurs.

21. Electricians can prevent this effect by insulating the wires or by installing fuses/circuit breakers.

22. Ploughing loosens the soil, which improves aeration and allows for better root penetration.

23. The source of energy in geothermal power stations is heat from the Earth's interior (magma).

24. A farmer can safeguard himself from bacteria by wearing protective gloves while weeding.

25. The state of matter with greater cohesion force is solid.

26. Materials for making compost should be covered to retain moisture and heat, which are crucial for decomposition.

27. Sand soil has large particles, which allows for good drainage.