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how deep is the ocean

The ocean is vast. It covers more than two-thirds of the Earth’s surface and has an average depth of about 11 km (6 miles). But what lies deep beneath the water’s surface? How deep is the ocean? Scientists have several different ways they measure the depth of the sea. The most common way is with a device called sonar. It gives us readings from sound waves that bounce off objects differently depending on their depth.

Another method involves lowering instruments into the ocean for long periods to collect readings every few meters. Here is all you need to know about how deep the sea is.

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