History of Earth's Interior
Evidence from Seismic Waves
Earth's Internal Structure
The Crust
The Mantle
A Different Structure
Earth's Core
Isostasy
Earth's Magnetic Field
Plate Tectonics
Evidence from the Ocean
Lithosphere Plates and Boundaries
A Closer Look: Measuring Plate Movement
Present-day Understandings
A Closer Look: Earth's Hot Spots
People Behind the Science: Harry Hammond Hess (1906-1969)
People Behind the Science: Frederick John Vine (1939-1988)