How Often do Asteroids Hit the Earth?: Crash Course Geology #20

Lecture 21 of 24 in Geology by CrashCourse. 11 min. Watch on YouTube

Course: Geology (Earth & Space). Covers: rocks plate tectonics earthquakes volcanoes minerals.

All lectures in Geology

1. Crash Course Geology Preview · 3 min
2. Intro to Geology: Crash Course Geology #1 · 9 min
3. How did Earth form?: Crash Course Geology #2 · 10 min
4. Earth's Crust and Mantle Explained: Crash Course Geology #3 · 10 min
5. What’s at the center of the earth?: Crash Course Geology #4 · 10 min
6. How Do Minerals Form?: Crash Course Geology #5 · 10 min
7. The Rock Episode: Crash Course Geology #6 · 9 min
8. How Do Gems Form?: Crash Course Geology #7 · 10 min
9. Where Do Diamonds Come From?: Crash Course Geology #8 · 10 min
10. How Water Shapes the Land: Crash Course Geology #9 · 10 min
11. What is Plate Tectonics: Crash Course Geology #10 · 10 min
12. How Do Mountains Form?: Crash Course Geology #11 · 9 min
13. The Deepest Point in the World: Crash Course Geology #12 · 11 min
14. Volcanoes Explained: Crash Course Geology #13 · 11 min
15. Earthquakes Explained: Crash Course Geology #14 · 11 min
16. Is it Possible to Prepare for an Earthquake?: Crash Course Geology #15 · 12 min
17. The Mystery Behind Earth’s Missing Rocks: Crash Course Geology #16 · 11 min
18. How old is the Earth?: Crash Course Geology #17 · 11 min
19. How Do Fossils Form?: Crash Course Geology #18 · 10 min
20. The Future of Glaciers: Crash Course Geology #19 · 11 min
21. How Often do Asteroids Hit the Earth?: Crash Course Geology #20 · 11 min
22. What is Geothermal Energy?: Crash Course Geology #21 · 11 min
23. How do we Mine Minerals?: Crash Course Geology #22 · 10 min
24. How Geologists Can Tell if the World is Warming : Crash Course Geology #23 · 12 min