An introduction to soil, explaining what it is, how it is formed, different types, its uses, and other related topics, with instructions for an activity.
Examines the structure and history of Earth from the perspective of visitors from a distant galaxy, focusing on different types of soil, their formation, components, and conservation; and includes an investigation of the relationship between the size of soil particles and their permeability.
Describes the formation of soil, the components of different kinds of soil, how soil sustains plant and animal life, and how farmers and others are using modern technology to fight erosion; and presents a hands-on demonstration about the size and permeability of soil particles.
Explains how soil is formed, why soil is important, and what soil needs to make plants grow, presenting a demonstration of the role rock erosion plays in soil formation and visiting a grade school where lunch leftovers and earthworms are used to improve the soil in the school's garden.
An introduction to soil, explaining what it is, how it is formed, different types, its uses, and other related topics, with instructions for an activity.
