Objects Production
Primary 4 · Science and Elementary Technology
Objects Production
Lesson 2 of 5
14 min
Let's begin
After the rain, Keza walks past the valley near her home. The ground is soft, grey and sticky. It clings to her shoes. Her grandmother smiles: "That is clay. When I was your age, we made cows and pots from it."
Can mud really become a toy? Let's find out.
Clay is a very fine kind of soil. It forms when rocks slowly break down into tiny grains, much smaller than grains of sand. In Rwanda you often find it in valleys and near marshes.
Try making a cow with long horns, a goat, a small pot or a doll.
Dry your toy slowly in the shade for a few days. If it dries too fast in hot sun, the outside shrinks before the inside and it cracks. When it is dry you can decorate it with coloured soil or paint.
Always wash your hands after working with clay.
Tip
Knead it, shape it, shade it
Knead out the air, shape your toy, then dry it in the shade. Three steps, no cracks!
Try each one first, then tap Show answer to check.
Why do we knead clay before shaping it?
Answer: To push out air bubbles, which can make the toy crack, and to make the clay smooth and soft.
Byiringiro's clay goat broke where the leg joined the body. What should he do next time?
Answer: Scratch both surfaces, add a little wet clay, press them together and smooth the joint.
What do we call clay that has been fired to make it hard?
Answer: Pottery.
Should you dry a clay toy in hot sun or in the shade?
Answer: In the shade, slowly, so it does not crack.
What you learned today
Sources and credits
The exercises (Try it yourself and the practice questions) are written by Ganzaa.
This lesson adapts CC BY-SA material and is shared under CC BY-SA 4.0.
Quick check
Clay grains are bigger than grains of sand.