This Science quiz is called 'Soil' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is an enjoyable way to learn if you are in the 3rd, 4th or 5th grade - aged 8 to 11.
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Did you know that it can take several hundred years for a layer of soil just one inch thick to form? That is one of the many reasons why topsoil should be preserved and not be allowed to 'run off' or be washed away. But what exactly is soil, or earth, made from? Well, it's a mixture of either sand or clay with water and decayed, or decaying, material called humus. Humus is formed from dead organisms and their nutrients become part of the soil. They can then be taken up by plants and enter the food chain once more.