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Topography of the Ocean Floor — Reading Comprehension

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This science passage with questions and answers on the ocean floor features diverse landscapes like continental shelves, abyssal plains, and mid-ocean ridges. These formations influence marine ecosystems, ocean currents, and natural resource exploration.

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The ocean floor is a vast and varied landscape, with features as dramatic as those found on land. It is divided into several distinct regions, each with unique characteristics.

The continental shelf is the shallowest part of the ocean floor, extending from the shoreline to a depth of about 200 meters (650 feet). It is rich in marine life and resources like oil and natural gas. Beyond the shelf lies the continental slope, a steep drop-off that leads to the abyssal plain, the flat, deep ocean floor that covers about 40% of the Earth’s surface.

The ocean floor also features towering mid-ocean ridges, underwater mountain ranges formed by tectonic plate movement. These ridges are sites of volcanic activity and are home to unique ecosystems, such as hydrothermal vents. In contrast, ocean trenches are the deepest parts of the ocean, with the Mariana Trench reaching depths of over 11,000 meters (36,000 feet).

Other notable features include seamounts (underwater mountains) and guyots (flat-topped seamounts). These formations provide habitats for marine life and influence ocean currents.

Scientists use tools like sonar and submersibles to map the ocean floor. Understanding its topography is crucial for studying marine ecosystems, predicting tsunamis, and exploring natural resources.

Fun fact: The ocean floor is home to the longest mountain range on Earth—the Mid-Atlantic Ridge, which stretches over 16,000 kilometers (10,000 miles)!

What is the shallowest part of the ocean floor?

Abyssal plainContinental slopeContinental shelfOcean trench

What is the flat, deep region of the ocean floor called?

Continental shelfAbyssal plainMid-ocean ridgeSeamount

What are mid-ocean ridges?

Flat, deep regions of the oceanUnderwater mountain ranges formed by tectonic activityThe shallowest parts of the oceanDeep ocean trenches

What is the deepest part of the ocean?

Continental slopeMid-Atlantic RidgeMariana TrenchAbyssal plain

What are seamounts?

Flat, deep regions of the oceanUnderwater mountainsShallow parts of the oceanDeep ocean trenches

What tool do scientists use to map the ocean floor?

TelescopesSonarThermometersBarometers

What is the fun fact mentioned in the passage?

The ocean floor has no mountainsThe Mid-Atlantic Ridge is the longest mountain range on EarthThe Mariana Trench is the shallowest part of the oceanSeamounts are found only on land

Why is understanding ocean topography important?

To study marine ecosystems and predict tsunamisTo measure air pressureTo study outer spaceTo predict earthquakes