Explain why clayey soil is not suitable for cultivating many crops and define an electromagnet.

(a) Three reasons why clayey soil is not suitable for cultivating many crops are:

• Poor drainage: Clay soil has very small particles and tiny pore spaces, leading to slow water drainage and waterlogging, which can suffocate plant roots.
• Poor aeration: The dense structure of clay soil limits air circulation, reducing oxygen availability for root respiration.
• Hardens when dry: Clay soil becomes very hard and compact when dry, making it difficult for roots to penetrate and for cultivation.

(b)

• (i) An electromagnet is a temporary magnet created when an electric