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What Mars Rovers Have Discovered

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-ESS1-3
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 comprehensive 400-500 word informational science passage for grades 6-8 explores how Mars rovers make discoveries about the Red Planet. Aligned with NGSS standards MS-ESS1.B and MS-ESS1-3, the passage focuses on the mechanisms rovers use to conduct science: driving across Martian terrain, drilling into rock samples, analyzing materials with onboard laboratories, and transmitting data back to Earth. Students learn how Curiosity and Perseverance have found evidence of ancient water, organic molecules, and conditions that may have once supported life. The passage emphasizes scientific processes and evidence-based reasoning. Audio-integrated features support diverse learners, while differentiated versions ensure accessibility for English Language Learners and struggling readers. Supplementary activities include comprehension questions, writing prompts, and graphic organizers that reinforce understanding of rover-based planetary science and the nature of scientific investigation.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

"NASA Mars Rover" by NASA/JPL/Cornell University, Maas Digital LLC / Wikimedia Commons

Mars rovers have discovered evidence that Mars once had liquid water and conditions that could have supported life. Scientists use these robotic explorers to study the Red Planet's surface and geology. Rovers like Curiosity and Perseverance carry sophisticated instruments that act as mobile science laboratories.

These rovers explore Mars using a careful process. First, they drive across the Martian surface using six wheels designed for rocky terrain. Scientists on Earth examine images sent by the rover's cameras. They identify interesting rocks or soil that may contain important clues. The rover then positions its robotic arm over the target location. A drill on the arm bores into the rock and collects powdered samples.

The collected samples move into the rover's onboard laboratory for analysis. Instruments heat the samples and measure the gases released. Other tools use lasers and X-rays to identify chemical elements present in the rocks. Scientists look for specific minerals that form only in the presence of water. Evidence shows that Curiosity found clay minerals in Gale Crater in 2013. These clays can only form when water interacts with rock over long periods.

Rovers have also detected organic molecules in Martian rocks. Organic molecules contain carbon and hydrogen atoms bonded together. While these molecules can come from living things, they can also form through non-biological processes. Scientists explain that finding organic molecules shows Mars had the chemical building blocks necessary for life. Perseverance recently collected samples from an ancient river delta in Jezero Crater. The layered rocks there suggest water flowed on Mars billions of years ago.

The rovers measure environmental conditions as they explore. Instruments track temperature, humidity, radiation levels, and atmospheric composition. Data indicates that ancient Mars had thicker air and warmer temperatures than today. These conditions may have made parts of Mars habitable for microbial life in the distant past.

Understanding how rovers make discoveries helps scientists plan future missions. The evidence collected by these robots guides our search for signs of ancient life. Each new finding teaches us more about how planets change over time.

Interesting Fact: The Curiosity rover has traveled over 18 miles on Mars since 2012, climbing 2,000 feet up Mount Sharp while analyzing dozens of rock samples along the way.

What is the main purpose of Mars rovers like Curiosity and Perseverance?

To transport astronauts across MarsTo study Mars's surface and search for evidence of past water and lifeTo build settlements on MarsTo mine minerals from Martian rocks

How do rovers collect rock samples on Mars?

They pick up rocks with their wheelsThey use a robotic arm with a drill to bore into rocks and collect powderThey melt rocks with lasersThey scoop up loose soil from the surface

What does the term 'organic molecules' mean in the context of the passage?

Molecules that can only come from living organismsMolecules made entirely of oxygenChemical compounds containing carbon and hydrogen that may or may not come from lifeMinerals found only in water

Why is the discovery of clay minerals in Gale Crater significant?

Clay minerals prove that aliens lived on MarsClay minerals form only when water interacts with rock over long periodsClay minerals can be used as fuel for roversClay minerals show that Mars has no atmosphere

Based on the passage, what can scientists infer about ancient Mars compared to present-day Mars?

Ancient Mars was colder and drier than todayAncient Mars had thicker air, warmer temperatures, and liquid waterAncient Mars had no atmosphere at allAncient Mars was exactly the same as it is today

Which instrument analysis method do rovers use to identify chemical elements in rocks?

Tasting the rock samplesListening to sounds the rocks makeUsing lasers and X-rays to analyze the samplesComparing rocks to pictures in a database

What does 'habitable' mean when scientists describe ancient Mars?

A place where humans could live without spacesuitsCapable of supporting life with appropriate conditionsA place with buildings and citiesCompletely covered in water

If a rover finds layered rocks in an ancient river delta, what can scientists conclude?

The rocks were brought from EarthWater flowed in that location over time, depositing sediments in layersMartians built structures thereThe rocks contain no useful information

True or False: Finding organic molecules on Mars proves that life currently exists there.

TrueFalse

True or False: Rovers send data and images back to Earth so scientists can analyze them and make decisions about what to study next.

TrueFalse