(a) (i) What is soil erosion?
(ii) Name two methods of controlling soil erosion

(b) (i) Explain each of the following terms as used in ecology:
(a) Adaptation
(ß) Endangered species

(c) (i) Give one example of hard water
(ii) Explain why it is advisable to drink water which is hard.

(d) (i) What is magnetic field?
(ii) State two methods of making magnets