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Contents of 13.1 Why are continents high and oceans low?

13.1 Why are continents high and oceans low?

Fig 13.2

• Elevation and crust type are related
• Earth's surface - 29% land
• Two elevations are the most common: 0.5 km above sea level and 4.5 km below sea level.
• But why are some parts of Earth's crust above sea level and some below?