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Topics > Earth Science > Oceanography

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How does the depth of the ocean affect its temperature?
Different parts of the ocean have different characteristics. The temperature of the ocean varies with the depth.

Difficulty: High school

Illustrate sea-floor spreading and subduction by building a model
This report describes how to build a model of the outer 300 km (180 miles) of the Earth that can be used to develop a better understanding of the principal features of plate tectonics, including sea-floor spreading, the pattern of magnetic stripes frozen into the sea floor, transform faulting, thrust faulting, subduction, and volcanism.

Difficulty: High school

What is soil erosion? Demonstrate how it happens
Erosion is the loss of soil from the land. It is a process that is always occuring but it can happen faster if we misuse the land.

Difficulty: Elementary school

Why is the ocean salty?
If the salt in the sea could be removed and spread evenly over the Earth's land surface it would form a layer more than 500 feet thick, about the height of a 40-story office building.

Difficulty: High school

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