Doesn't the level of the ocean vary from hour to hour and from year to year? Then, what do we really mean by "sea level" when we are talking about elevation? Find out what geodesists, those who work with the math behind the shape and area of the planet, use to define sea level. 

Concepts

gravitational field, gravity, sea level

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Additional Tags

sea level, earth strucutre, geodesist, geodesy, gravitational field, science

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Classroom Considerations

• This video is hosted on YouTube

Pros

• Fast-moving narration and hand-drawn animation keep viewers on their toes
• A fascinating topic for advanced earth science courses
• Demonstrates how mathematics helps answer scientific questions

Cons

• None