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What Is the Asthenosphere

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Format: Interactive (Online), Printable (PDF)
Grades: 5678
Subjects: scienceela
Standards: MS-ESS2-1
Languages: English, Spanish

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About this reader

science,ela

Written by Workybooks TeamPublished by Workybooks

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Right beneath Earth's rigid outer shell lies a layer that makes plate tectonics possible. This layer is called the asthenosphere, and it forms the upper part of the mantle. The asthenosphere is hotter, softer, and partly able to flow compared to the layer above it. Scientists explain that its name comes from a Greek word meaning "weak," which describes its key characteristic perfectly.

The asthenosphere sits directly below the lithosphere, which is Earth's rigid outer layer that includes the crust and upper mantle. Evidence shows that the asthenosphere extends from about 100 kilometers to roughly 350 kilometers below Earth's surface. The temperature in this zone ranges from about 1,300 to 2,400 degrees Celsius. These extreme temperatures cause the rock to behave differently than the solid rock above. The rock in the asthenosphere can flow very slowly, like thick putty or warm taffy. This flowing property is called plasticity.

The contrast between the strong lithosphere and the weak asthenosphere is crucial for plate movement. Because the rigid tectonic plates sit on top of the flowing asthenosphere, they can move across Earth's surface. The asthenosphere acts like a conveyor belt beneath the plates. Heat from deep within Earth creates convection currents in the mantle. These currents cause the asthenosphere to churn and flow. As the asthenosphere moves, it carries the plates along with it.

Scientists observe this process at work in places like Iceland. Iceland sits on the Mid-Atlantic Ridge, where two tectonic plates are slowly moving apart. The North American Plate and the Eurasian Plate separate at a rate of about 2.5 centimeters per year. This movement happens because the asthenosphere beneath Iceland flows and pushes the plates in opposite directions. Without the soft, flowing asthenosphere, the rigid plates would remain locked in place.

Understanding the asthenosphere helps scientists explain earthquakes, volcanic eruptions, and mountain formation. The asthenosphere's ability to flow makes it possible for continents to drift over millions of years. This layer completes the picture of how Earth's surface can shift and change. The asthenosphere and lithosphere work together as a system that shapes our planet's surface features.

Interesting Fact: The rock in the asthenosphere is so hot that it glows red, yet it remains solid because of the intense pressure from the layers above. Only about one to two percent of the rock is actually melted.

What does the name 'asthenosphere' mean?

StrongWeakHotFlowing

Where is the asthenosphere located?

Above the lithosphereIn Earth's coreBelow the lithosphere in the upper mantleAt Earth's surface

What is the approximate temperature range in the asthenosphere?

100 to 500 degrees Celsius500 to 1,000 degrees Celsius1,300 to 2,400 degrees Celsius3,000 to 4,000 degrees Celsius

What does the term 'plasticity' refer to in the passage?

The ability of rock to break easilyThe ability of rock to flow slowly like thick puttyThe hardness of rockThe color of rock

How does the asthenosphere help tectonic plates move?

It pushes plates from below with explosive forceIt acts like a flowing layer that carries plates alongIt pulls plates downward into EarthIt freezes plates in place

What creates convection currents in the mantle?

Cold temperatures from spaceWind on Earth's surfaceHeat from deep within EarthOcean water

At what rate do the North American Plate and Eurasian Plate separate in Iceland?

About 2.5 centimeters per yearAbout 10 centimeters per yearAbout 1 meter per yearAbout 25 centimeters per year

If the asthenosphere were completely solid and rigid, what would happen to tectonic plates?

They would move fasterThey would remain locked in placeThey would float on waterThey would break into smaller pieces

The asthenosphere is part of Earth's crust.

TrueFalse

The lithosphere is softer and weaker than the asthenosphere.

TrueFalse

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This comprehensive 400-500 word reading passage explores the asthenospherea crucial layer of Earth's upper mantle that enables plate tectonics. Designed for middle school students in grades 6-8the passage aligns with NGSS standard MS-ESS2-1 and the Disciplinary Core Idea MS-ESS2.A. Students learn how the asthenosphere's hotsoftflowing properties contrast with the rigid lithosphere aboveallowing tectonic plates to move across Earth's surface. The passage includes real-world connectionsevidence-based scientific languageand an engaging interesting fact. Audio-integrated features support diverse learnerswhile differentiated versions and Spanish translations ensure accessibility. The lesson includes 10 multiple-choice questions spanning literal comprehension to application3 scaffolded writing prompts with model answersa comprehensive glossary of 8-10 key termsand two graphic organizers that help students compare and contrast the lithosphere and asthenosphere while analyzing cause-and-effect relationships in plate tectonics. This complete curriculum package provides teachers with ready-to-use materials for teaching this foundational Earth science concept.