How old is Earth and how do scientists know the answer? Throughout history, many researchers, scholars, and leaders answered this question with varying degrees of accuracy. The 20th episode of Crash Course History of Science introduces the changing thoughts on this question and others related to Earth Science. 

Concepts

the earth's history, chronological order, famous scientists, fossils

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Additional Tags

science

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Instructional Ideas

• Create a visual timeline of each of the scientists and discoveries mentioned in the video

Classroom Considerations

• Relies on prior knowledge of the age of Earth, fossils, and scientists
• Content ends at 12:48, almost a full minute before the video ends

• This video is hosted on YouTube

Pros

• Provides closed captioning for the hearing impaired
• Works well in traditional or flipped classes

Cons

• None

Common Core

RST.9-10.4 RST.11-12.4