In this activity, learners will experiment with the idea of soil erosion, which is the washing or blowing away of soil. Your scientist will also hypothesize about ways to help prevent soil erosion. Throughout the experiment, you will ask questions that will inspire your child to think about soil erosion, as well as to consider more ways to make discoveries and draw conclusions about soil erosion. Note: This assignment requires preparation and about a week or so for the grass to grow.
Explain to your child that soil is found on the uppermost layer of the Earth’s crust. Soil is a mixture of four main ingredients: weathered rock, long-dead plants and animals, air, and water. Soil is important because it provides a place where organisms and bacteria can live. Plants rely on soil for nutrients, water, and mineral salts. Plants in turn provide the oxygen we breathe, the food we eat, the clothes we wear, and the foundation and building materials we use to make our homes. We could not meet our basic needs without soil!