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What Causes Moon Phases

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-ESS1-1
Languages: English, Spanish

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What's included

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

Bilingual support

About this reader

This comprehensive 400-500 word reading passage explores what causes Moon phases for middle school students in grades 6-8. Aligned to NGSS standard MS-ESS1-1 and disciplinary core idea MS-ESS1.B, the passage explains how Moon phases result from our changing view of the Moon's sunlit side as it orbits Earth. Students discover that the Moon does not produce its own light but reflects sunlight, and that the predictable cycle from new moon to full moon occurs because of the Moon's position relative to Earth and the Sun. The passage includes real-world connections, scientific vocabulary development with 8-10 glossary terms, and an engaging fact. Audio-integrated content supports diverse learners. Activities include 10 multiple-choice questions spanning comprehension levels, 3 scaffolded writing prompts with model answers, and graphic organizers. A simplified differentiated version (Flesch-Kincaid 3.0-5.0) ensures access for English Language Learners and struggling readers. Complete Spanish translations of both passages support bilingual education. This standards-aligned resource develops scientific reasoning while building literacy skills across multiple modalities.

Written by Workybooks TeamPublished by Workybooks

Sample passage and quiz content

CONTENT PREVIEW

"A stunning black and white image showcasing the lunar phases against a dark background." by Astrofotos PB / Pexels.

Have you noticed the Moon looks different throughout the month? Sometimes it appears as a thin crescent, other times as a bright full circle. These changes are called moon phases, and they happen because we see different amounts of the Moon's sunlit side as it moves around Earth. The Moon does not produce its own light. Instead, it acts like a mirror, reflecting sunlight back to us.

The Moon completes one orbit around Earth approximately every 29.5 days. During this journey, the Moon's position changes relative to Earth and the Sun. Scientists explain that half of the Moon always faces the Sun and receives light. However, we can only see the portion of that lit half that faces Earth. When the Moon sits between Earth and the Sun, the sunlit side faces away from us. This creates a new moon, when the Moon appears invisible in our sky. As the Moon continues its orbit, we begin to see a sliver of the lit side. This thin curve is called a crescent phase.

About one week after the new moon, the Moon reaches a position where we can see exactly half of its lit side. This is called the first quarter phase, even though it looks like a half moon. The Moon keeps moving, and we see more of the sunlit surface each night. When the Moon moves to the opposite side of Earth from the Sun, the entire lit half faces us. This creates the full moon, the brightest phase. Evidence shows that full moons occur roughly every 29.5 days. After the full moon, the visible lit portion gradually shrinks through phases called waning until the cycle returns to new moon.

Observers throughout history have tracked moon phases to create calendars and predict tides. The lunar cycle remains consistent and predictable because the Moon's orbit follows regular patterns. Understanding moon phases helps scientists study Earth's place in the solar system. This knowledge also connects to practical applications like planning astronomical observations and understanding how the Moon influences ocean tides through gravitational forces.

Interesting Fact: During a full moon, the Moon appears about 14,000 times dimmer than the Sun, even though both appear similar in size from Earth. The Moon only reflects about 12 percent of the sunlight that hits its surface.

What causes the Moon to appear bright in the night sky?

The Moon produces its own light like a starThe Moon reflects sunlight back to EarthThe Moon glows because of heat inside itThe Moon absorbs light from other planets

How long does it take the Moon to complete one orbit around Earth?

About 7 daysAbout 14.75 daysAbout 29.5 daysAbout 365 days

What is a new moon?

When the entire lit side of the Moon faces EarthWhen the Moon is between Earth and the Sun with its lit side facing away from EarthWhen exactly half of the Moon's lit side is visibleWhen the Moon is at its brightest

In the passage, what does the word 'waning' mean?

When the visible lit portion of the Moon is increasingWhen the Moon is at its brightest pointWhen the visible lit portion of the Moon is decreasingWhen the Moon is invisible in the sky

What does 'orbit' mean in the context of the passage?

The light reflected from the Moon's surfaceThe curved path the Moon takes as it moves around EarthThe different shapes the Moon appears to haveThe time it takes for the Moon to rotate once

Why do we see different moon phases throughout the month?

Because the Moon moves closer to and farther from EarthBecause Earth's shadow covers different parts of the MoonBecause we see different amounts of the Moon's sunlit side as it orbits EarthBecause the Sun shines on different parts of the Moon each night

If you wanted to observe the brightest moon phase, which phase would you look for?

New moonCrescent moonFirst quarter moonFull moon

Based on the passage, what can you conclude about the relationship between the Moon's position and the phases we see?

The Moon's position relative to Earth and the Sun determines which part of the lit side we can seeThe Moon's position does not affect the phases we observeThe Moon's position only matters during a full moonThe Moon changes its own brightness depending on its position

The Moon produces its own light just like the Sun does.

TrueFalse

Half of the Moon always faces the Sun and receives light.

TrueFalse