soil ecology

Presents a look at what soil is, how it evolved, how it supports life, and why it wears out, and includes profiles of the plants and animals that form the ecosystem of healthy soil and explains how to nurture them.

Briefly describes the composition of different types of soil, the variety of plants and animals that live in it, and the necessity of soil to human life.

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

Examines the properties and uses of soil and describes how it functions as both a home for plants and animals and as a building material.

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

Discusses the nature and importance of soil and the many forms of life it supports.

Examines the beauty and functions of the Earth as a living organism, describes how the planet changes through the seasons, and discusses how it supports life.

Provides an overview of soil, discussing its formation, composition, and uses.

Discusses the sources, ingredients, types, and nutrients of soil and the life forms that it supports.