Lecture 3 - Frequency of Impacts

Lecture 3 - Evidence Supports the Impact Theory

Lecture 3 - The Impact Crater

Lecture 3 - Shock Wave and Global Wildfire

Lecture 3 - Deep Ocean Sediments

Lecture 3 - Glass Spherules and Bucky Balls

Lecture 3 - Rare Elements

Lecture 3 - Shocked Quartz Distributions

Lecture 3 - Gubbio, Italy

Lecture 3 - Early Scientific Views

Earth Science - Frontiers of Science

Lecture 1 - Solar Variability

Lecture 1 - What Controls the Earth's Temperature

Lecture 3 - The Cretaceous-Tertiary Event

Lecture 2 - The Story of Human Evolution

Lecture 1 - Carbon Dioxide

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