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20860_Editing_explanations_Years_4_and_5

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Why do stars twinkle?<br />

Lesson focus<br />

Teachers notes<br />

Punctuation<br />

• Capital letters for proper nouns<br />

• Capital letters for titles<br />

• Grammatical commas<br />

• Apostrophes to show possession<br />

Grammar<br />

• Pronouns<br />

Spelling<br />

• Confused words: threw/through,<br />

which/witch<br />

• Misspelt words<br />

Vocabulary<br />

• Compound words<br />

Writing<br />

• Double negatives<br />

Teacher information<br />

An explanation tells how <strong>and</strong> why something happens.<br />

Answers<br />

Twinkle, twinkle, little star<br />

You may be surprised to learn that stars actually never<br />

do any twinkling at all! When you look at a star, you are<br />

seeing it through the thick layers of air that make<br />

up the Earth’s atmosphere. When the star’s light<br />

passes through these layers of air, the light is bent or<br />

‘refracted’ differently by each layer. This is because of<br />

moisture in the air as well as different air temperatures<br />

<strong>and</strong> the movement of the air. Together, they make the<br />

starlight seem to be moving, which we see as twinkling.<br />

surprised<br />

you<br />

it<br />

atmosphere<br />

through<br />

differently<br />

moisture<br />

they<br />

which<br />

1. Missing punctuation is in bold type.<br />

2. (a) Pronouns are underlined.<br />

(i) you (line 2), it (line 3), they (line 8)<br />

(ii) Teacher check<br />

3. Spelling errors are in italic type.<br />

(a) surprised, atmosphere, through, differently, moisture, which<br />

4. (a) Teacher check<br />

5. (a) One way of correcting the double negative is underlined in bold.<br />

‘… stars actually never do no twinkling …’ should read ‘… stars actually never do any twinkling<br />

…’ or ‘… stars actually do no twinkling …’<br />

12 <strong>Editing</strong> skills R.I.C. Publications ® www.ricgroup.com.au

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