soil ecology

Detailed photographs with interesting facts explore the underground world of animals, insects, plants, and people who work underground.

Describes types of soil and their uses.

Describes what soil is made of, different kinds of soil, and how things live and grow in soil.

Describes what soil is and why it is important.

An overview of soil that describes its formation, components, acidity, and the plants and animals that make it their home and provides step-by-step, illustrated instructions for five hands-on soil-related projects.

Describes the nutrients soil holds, the insects and other animals that live in soil, and the growth of plants from seeds, and includes related experiments.

Discusses the composition of soil and the different ways that it is made, covering topics such as humus, microbes, nutrient cycles, aeration, burrowers, erosion, and climate.

Brief text explores how soil is formed, its layers, and its importance as a natural resource that living things need to survive.

Illustrations, photographs, and text describe where dirt comes from and its importance to nature; and includes instructions for creating a fossil footprint and growing a garden playhouse.

Examines the earthworm and its environment, suggesting experiments to introduce basic ecological concepts as demonstrated by the earthworm's survival in its habitat.