Clutch Size in Birds

How Effective Are Structural Plant Defenses?

Invading Algae

Nineteenth-Century Theories of Mountain Formation

Early Research on Air

Physical Properties of Minerals

Alfred Wegener's Theory of Continental Drift

Rain Forest Soils

Stream Deposits

Ancient Coastlines

The Origin of Petroleum

Explaining Dinosaur Extinction

Callisto and Ganymede

Climate of Venus

Microscopes

Soil Formation

Distributions of Tropical Bee Colonies

The Allende Meteorite

The Origins of Agriculture

Succession, Climax, and Ecosystems

Lightning

Development of the Periodic Table

Minerals and Plants

Depletion of the Ogallala Aquifer