A new math curriculum

Positive and Negative Numbers (Introduction)

Sea Level Image
Before you try the problems, you should take a look at the for this unit.
If you are a teacher, you can see special for this unit.

Practice Your Math!

What happens to sunlight in the ocean?


Physical Oceanographer Emmanuel Boss studies the relationship between light and ocean water. He uses satellites to see how much light bounces off of the ocean’s surface. And he spends time on the water, using different tools to figure out what forms of life and other objects are in Earth’s oceans.


Click on the photo of the scientist to learn more about him

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