Materials:

* Soil sample

* Magnet

* Glass or plastic container

* Water

Procedure:

1. Collect a soil sample from the area you want to test.

2. Place the soil sample in a glass or plastic container.

3. Add water to the container until the soil is completely covered.

4. Stir the soil and water mixture thoroughly.

5. Hold the magnet close to the container and move it around.

6. Observe whether any of the soil particles are attracted to the magnet.

Results:

If any of the soil particles are attracted to the magnet, it indicates that the soil contains magnetic iron. The more soil particles that are attracted to the magnet, the higher the concentration of magnetic iron in the soil.

Explanation:

Magnetic iron is a type of iron oxide mineral that is naturally magnetic. When magnetic iron is present in soil, it can be attracted to a magnet. This property can be used to test for the presence of magnetic iron in soil.