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What Are Fossils

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Format: Interactive (Online), Printable (PDF)
Grades: 345
Subjects: scienceelareading
Standards: NGSS 4-ESS1-1
Languages: English, Spanish

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Reading passage

Reading comprehension

Audio narration

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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 250-word reading passage introduces fourth-grade students to the concept of fossils as preserved remains or traces of ancient organisms. Aligned with NGSS standard 4-ESS1-1, the passage explains how fossils form in rock layers and what they reveal about life millions of years ago. Students learn that fossils can include bones, teeth, shells, leaf imprints, and even footprints. The passage emphasizes how paleontologists use fossils as evidence to understand what ancient organisms looked like, where they lived, and what their environments were like. Written at a Grade 4 reading level, the content uses accessible language and familiar examples to build foundational understanding. The passage includes bolded vocabulary terms with immediate definitions and concludes with an interesting fact about fossil preservation. Audio integration supports diverse learners by providing text-to-speech functionality. Supplementary activities include multiple-choice comprehension questions, writing prompts, and graphic organizers that reinforce key concepts about fossils and ancient environments. This resource helps students develop scientific thinking skills while exploring earth science concepts essential for elementary science education.

Written by Workybooks TeamPublished by Workybooks

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CONTENT PREVIEW

"Fossils at the Geological Museum, Tsukuba 7" by Syced / Wikimedia Commons.

Fossils are the preserved remains or traces of plants and animals that lived long ago. When living things died millions of years ago, some of them were buried quickly by mud, sand, or other materials. Over time, these materials hardened into rock, and the remains inside became fossils. Fossils help scientists learn about life from the past.

There are different types of fossils. Some fossils are actual body parts like bones, teeth, or shells that turned to stone over millions of years. These are called body fossils. Other fossils are traces that organisms left behind, such as footprints, burrows, or leaf prints pressed into mud that later became rock. These are called trace fossils.

Scientists called paleontologists study fossils to understand what ancient organisms looked like and how they lived. Fossils are found in rock layers all around the world. Different rock layers contain different fossils, which tells scientists about different time periods in Earth's history. For example, fossils of ocean animals found in rock layers tell us that area was once covered by water, even if it is now dry land.

Fossils act like clues from the past. They show us that Earth has changed over millions of years and that many different kinds of plants and animals have lived here. Some of these organisms, like dinosaurs, no longer exist today.

Interesting Fact: The oldest fossils ever discovered are tiny bacteria fossils that are about 3.5 billion years old! These ancient fossils show that life on Earth began a very long time ago.

What are fossils?

Rocks that are very colorfulPreserved remains of ancient organismsNew plants growing todayTools used by scientists

What are body fossils made from?

Footprints in mudBones, teeth, or shellsWater and airLiving animals

What do paleontologists study?

Weather patternsModern animals onlyFossils from ancient organismsOcean currents

Why do fossils appear in rock?

Animals put them thereMud and sand hardened over timeScientists create themRain washes them into rocks

What can ocean fossils tell scientists?

An area was once underwaterDinosaurs lived thereThe weather was coldPlants grew very tall

How do fossils help us understand Earth?

They show Earth never changesThey prove all animals still existThey show Earth changed over timeThey tell us about the future

Fossils can only be bones and teeth.

TrueFalse

What does 'preserved' mean in the passage?

Destroyed completelyKept safe over long timeMade into new rocksHidden from scientists

Who it's for

Perfect for the way you teach

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Build comprehension skills
Auto-graded quiz
Differentiated reading

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Topics

fossilspaleontologyancient liferock layerspreserved remainsdinosaursNGSS 4-ESS1-1Grade 4 scienceearth science

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