Video · Where do rocks come from?: Crash Course Geology #6 TwitterShare on Facebook0 25 views Crash Course - May 21, 2026 Science Crash Course More Videos What is Plate Tectonics: Crash Course Geology #10 Science · 6 days ago What is Plate Tectonics: Crash Course Geology #10 Science · 6 days ago How Water Shapes the Land: Crash Course Geology #9 Science · 2 weeks ago How Water Shapes the Land: Crash Course Geology #9 Science · 2 weeks ago Myths About Diamonds: Crash Course Geology #8 Science · 3 weeks ago How Do Gems Form?: Crash Course Geology #7 Science · 4 weeks ago How Do Gems Form?: Crash Course Geology #7 Science · 4 weeks ago A Message From Hank Green Science · May 28, 2026