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Could We Drill to Earth's Core

Interactive passage with audio narration, comprehension questions, and printable PDF.

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

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Reading passage

Reading comprehension

Audio narration

With word word highlighting

Comprehension quiz

Auto-graded

Writing activity

Open-ended response

Glossary & flashcards

Vocabulary practice

Differentiated version

Adapted for varied levels

Spanish translation

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About this reader

This engaging 500-word reading passage for grades 6-8 addresses a question students frequently ask: Could we drill to Earth's core? Aligned with NGSS standard MS-ESS2-1 and disciplinary core idea MS-ESS2.A (Earth's Materials and Systems), the passage explains why such drilling is impossible with current technology. Students explore the Kola Superdeep Borehole in Russia, which reached only 7.5 miles deep before extreme temperatures and pressures forced operations to stop. The passage emphasizes how scientists use indirect evidence, including seismic waves from earthquakes and volcanic samples, to understand Earth's layered structure. Audio-integrated features support diverse learners, while differentiated versions accommodate English Language Learners and struggling readers. Activities include comprehension questions, writing prompts, and graphic organizers that reinforce understanding of Earth's interior layers, the challenges of deep drilling, and scientific methods for studying inaccessible regions. This standards-aligned resource helps students understand how scientists gather evidence about Earth's structure when direct observation is impossible.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

1987 CPA 5892 — A USSR stamp, Science in USSR.Date of issue: 25th November 1987..0 K. deep dull green, blue-black and azure. Kolskaya borehole / Wikimedia Commons

Could humans ever drill all the way down to Earth's core? The answer is no, not with any technology we have today. The deepest hole ever drilled reached only about 7.5 miles into Earth's crust. This famous project, called the Kola Superdeep Borehole in Russia, had to stop in 1992. The core lies nearly 4,000 miles below the surface, making it thousands of miles beyond our reach.

Several enormous obstacles prevent us from drilling deeper. Temperature rises dramatically as you go down into Earth. The Kola borehole encountered temperatures above 350 degrees Fahrenheit, much hotter than scientists expected. At greater depths, temperatures can exceed 10,000 degrees Fahrenheit near the core. These extreme conditions cause metal drill bits to soften and fail. Pressure also increases with depth, reaching millions of pounds per square inch. This intense pressure can crush equipment and cause surrounding rock to behave more like soft plastic than solid material.

The rock itself creates problems for drilling operations. Deep underground, rock becomes so hot and compressed that it flows into drill holes. Engineers describe this as rock acting like toothpaste being squeezed from a tube. The borehole walls can collapse or seal themselves shut. Removing rock debris from such deep holes also becomes nearly impossible as friction and heat increase.

Because direct access to Earth's interior remains impossible, scientists rely on indirect evidence to study what lies below. Seismic waves from earthquakes provide the most valuable information. These energy waves travel through Earth at different speeds depending on the material they pass through. Scientists observe how seismic waves bend, reflect, and change speed as they move through different layers. This evidence reveals that Earth has distinct layers: the thin outer crust, the thick rocky mantle, and the metallic core divided into liquid outer and solid inner sections.

Scientists also study rock samples that volcanic eruptions bring to the surface from deep in the mantle. Meteorites that fall to Earth provide clues too, since they formed from the same materials as our planet. Laboratory experiments help scientists understand how materials behave under extreme pressure and temperature. Computer models combine all this evidence to create detailed pictures of Earth's interior structure.

Understanding Earth's interior matters for many reasons. The core generates Earth's magnetic field, which protects us from harmful solar radiation. Movement in the mantle drives plate tectonics, causing earthquakes and volcanic eruptions. Scientists continue developing new ways to study Earth's unreachable depths, proving that clever thinking can reveal secrets that direct observation cannot.

Interesting Fact: The Kola Superdeep Borehole took over 20 years to drill and cost millions of dollars, yet it penetrated less than one-third of one percent of the distance to Earth's center.

How deep did the Kola Superdeep Borehole reach before drilling stopped?

About 7.5 milesAbout 75 milesAbout 4,000 milesAbout 350 miles

What are the two main obstacles that prevent drilling to Earth's core?

Cost and timeTemperature and pressureDistance and darknessRock hardness and equipment weight

What does the term 'indirect evidence' mean in the passage?

Evidence collected by drilling deep holesEvidence gathered through clues rather than direct observationEvidence that is not reliable or accurateEvidence collected from other planets

What type of indirect evidence provides the most valuable information about Earth's interior?

Volcanic rock samplesMeteorites from spaceSeismic waves from earthquakesComputer models

Based on the passage, why does rock deep underground behave like soft plastic or toothpaste?

Because it is mixed with waterBecause it is very oldBecause of extreme heat and pressureBecause drilling equipment softens it

What can scientists learn by observing how seismic waves change speed and direction?

The age of EarthThe different layers and materials inside EarthWhen the next earthquake will occurHow to drill deeper holes

According to the passage, what important function does Earth's core serve?

It provides fuel for volcanoesIt generates Earth's magnetic fieldIt controls ocean tidesIt creates Earth's atmosphere

Why do scientists study meteorites to learn about Earth's interior?

Meteorites come from Earth's coreMeteorites are easier to study than rocksMeteorites formed from the same materials as EarthMeteorites contain seismic waves

True or False: The Kola Superdeep Borehole reached more than halfway to Earth's core.

TrueFalse

True or False: Scientists can only study Earth's interior by drilling deep holes.

TrueFalse