Clutch Size in Birds
Early Horses
How Effective Are Structural Plant Defenses?
Invading Algae
The Impact Origin of Lunar Craters
Electrical Energy from the Ocean
Nineteenth-Century Theories of Mountain Formation
Pacific Ecosystems
Predicting Volcanic Eruptions
The Pit Organs of Snakes
Early Research on Air
Structure and Composition of Comets
Physical Properties of Minerals
Conditions on Earth When Life Began
Dealing with Extreme Cold
Pests and Pesticides
Alfred Wegener's Theory of Continental Drift
Evolution of the Flowering Plants
Elements of Life
Rain Forest Soils
Stream Deposits
Memphis: United Egypt’s First Capital
Ancient Coastlines
The Origin of Petroleum
Explaining Dinosaur Extinction
Callisto and Ganymede
Climate of Venus
Latitude and Biodiversity
The Extinction of Moa
Microscopes
The Racoon's Success
Soil Formation
Distributions of Tropical Bee Colonies
Speciation in Geographically Isolated Populations
Groundwater
Survival of Plants and Animals in Desert Conditions
The Allende Meteorite
The Origins of Agriculture
Discovering the Ice Ages
Succession, Climax, and Ecosystems
Lightning
Development of the Periodic Table
Planets in Our Solar System
Mass Extinctions
The Geologic History of the Mediterranean
Minerals and Plants
Deer Populations of the Puget Sound
Desert Formation
Variations in the Climate
William Smith
Depletion of the Ogallala Aquifer
Timberline Vegetation on Mountains