Why Does the Moon Change Shape? | A2 ESL Science Reading Passage

The Moon stays round even when it looks like a thin crescent. Read this A2-B1 passage, learn five useful words, and try the five questions.

Prefer paper? Download the three-page worksheet. Print pages 1-2 for students and keep page 3 as the answer key.

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An illustration of observing the Moon on different evenings.

Reading Level

A2-B1

Word Count

220 words

Reading Passage

The Moon looks different during the month. Sometimes it is round and bright. Sometimes it looks like a thin curve. But the Moon does not really change shape.

The Moon looks bright because it reflects sunlight. One half of the Moon is always lit by the Sun. The other half is dark. As the Moon moves around Earth, we see different parts of the lit side.

This changing view is called a phase. A new moon happens when the lit side mostly faces away from Earth. The Moon is still there, but it is hard to see.

After that, more of the lit side becomes visible each night. This is called waxing. The Moon may look like a crescent, then a half moon, and then almost full. A crescent moon is one of the easiest phases to notice.

A full moon happens when we can see the whole lit side of the Moon. It looks round and bright in the night sky. After the full moon, the lit part we see becomes smaller. This is called waning.

The Moon continues to orbit Earth. The same pattern of phases repeats about every 29.5 days.

The Moon's changing shape is really a changing view. The Sun lights the Moon, the Moon moves around Earth, and our view changes night by night.

Eight Moon phases, shown from the Northern Hemisphere.

Key Vocabulary

Word	Meaning and Example
sunlight	light from the sun The Moon reflects sunlight.
phase	one of the different shapes the Moon seems to have A full moon is one moon phase.
crescent	a thin curved shape like part of a circle The crescent moon looked small and bright.
orbit	to move around a planet or object in space The Moon orbits Earth.
reflect	to send light back from a surface The Moon reflects light from the Sun.

Reading Comprehension Questions

1. Does the Moon really change shape?
2. Why does the Moon look bright?
3. What is a moon phase?
4. What happens during a full moon?
5. Why do the phases repeat?

Answers

1. No. The Moon does not really change shape.
2. It looks bright because it reflects sunlight.
3. A moon phase is one of the different shapes the Moon seems to have.
4. During a full moon, we can see the whole lit side of the Moon.
5. The phases repeat as the Moon orbits Earth. One complete cycle takes about 29.5 days.

Short Summary

The Moon seems to change shape because we see different parts of its sunlit side as it orbits Earth. These changing views are called moon phases.

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Science sources: NASA Moon Phases and Top Moon Questions.