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What is sea level?

About 70% of the Earth is covered by water in the form of oceans and seas. In this lesson, you will begin a study of the surface of the oceans, which is called sea level, and you will learn about different forces that can affect it. The surface of the ocean can change dramatically over time. This lesson will focus on short time period changes (hours, days, months), the next lesson on ice volume will focus on much longer time period changes. Here are some interesting photos to show you what we are going to learn about: