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Page 1: Cambridge University Press 978-1-316-61102-9 — Cambridge Primary Science …assets.cambridge.org/97813166/11029/excerpt/... · 2015. 12. 17. · Cambridge University Press 978-1-316-61102-9

Cambridge University Press978-1-316-61102-9 — Cambridge Primary Science Skills Builder 3Jon Board , Alan Cross ExcerptMore Information

www.cambridge.org© in this web service Cambridge University Press

✶ ▲♦♦�✁✂✄ ☎✆✝❡✞ ✟✠☎✂✝✡ ✺

❲❤☛☞ ✌✍☛✎♥✍✎✏ ✑✒✌✌ ✓✎☛❛☞✒✏✍ ☛♥✔ ✎✍✒♥✕✖✎❛✍

❚✗✘ ✙✚✛✜✢✜✛✜✘✣ ✜✤ ✛✗✜✣ ✥✦✜✧✧✣ ★✩✜✧✪✘✫ ✩✤✜✛ ✬✜✢✘ ✧✘✙✫✤✘✫✣ s✩✫✛✗✘✫ ✭✫✙✚✛✜✚✘

✜✤ ✛✗✘ s✐✧✧✐✇✜✤✬ ✛✐✭✜✚✣ ✜✤ ✛✗✘ ✮✘✙✫✤✘✫✯✣ ★✐✐✦ ✙✤✪ ✰✚✛✜✢✜✛✱ ★✐✐✦✲

✳✖✓✒❛ ■♥ ☞❤✒✏ ☞✖✓✒❛✴ ✌✍☛✎♥✍✎✏ ✑✒✌✌✵

✷✸✷ ✹✻✼✽✾✿ ✼✽❀ ✾❁❂❃❄ ❅✼❄✾✿ ✽✼❆❂ ✾❁❂ ❇❈❉❄ ❆✼❃✽ ❅✼❄✾✿ ❈❇ ❅✻✼✽✾✿

✷✸❊ ✹✻✼✽✾✿ ✽❂❂❀ ✻❃❋❁✾

✼✽❀ ●✼✾❂❄✻❂✼❄✽ ✾❁✼✾ ❅✻✼✽✾✿ ✽❂❂❀ ✻❃❋❁✾ ✼✽❀ ●✼✾❂❄

✷✸❍ ❏❄✼✽✿❅❈❄✾❃✽❋ ●✼✾❂❄ ❃✽✈❂✿✾❃❋✼✾❂ ●❁✼✾ ❁✼❅❅❂✽✿ ✾❈ ✼ ❅✻✼✽✾ ●❃✾❁❈❉✾ ❄❈❈✾✿

✷✸❑ ✹✻✼✽✾ ❋❄❈●✾❁

✼✽❀ ✾❂❆❅❂❄✼✾❉❄❂✻❂✼❄✽ ✾❁✼✾ ❅✻✼✽✾✿ ✽❂❂❀ ●✼❄❆✾❁

▼✍✌✓ ◆✖❖✎ ✌✍☛✎♥✍✎

P◗ ❘❙❯❱ ❳◗❯❘❨ ❩❬❭❪◗❬❪❱ ❫❯❩❩ ❴❪❭❵❘❯❱❬ ❜❝❱❬❪❞❯◗❢ ❭◗❣ ❵❜❥❴❭❪❯◗❢

❜❝❦❬❵❘❱❨ ❩❯❞❯◗❢ ❘❙❯◗❢❱ ❭◗❣ ❬❞❬◗❘❱ ❧♠❬❵❘❯❜◗ ♣q♣rq t❙❬✉ ❫❯❩❩

❭❩❱❜ ❣❪❭❫ ❵❜◗❵❩❳❱❯❜◗❱ ①❪❜❥ ❪❬❱❳❩❘❱ ❭◗❣ ❝❬❢❯◗ ❘❜ ❳❱❬

❱❵❯❬◗❘❯②❵ ③◗❜❫❩❬❣❢❬ ❘❜ ❱❳❢❢❬❱❘ ❬④❴❩❭◗❭❘❯❜◗❱ ❧♠❬❵❘❯❜◗ ♣q⑤rq

t❜ ❙❬❩❴ ❘❙❬❥⑥

⑦ ⑧◗❵❜❳❪❭❢❬ ❩❬❭❪◗❬❪❱ ❘❜ ❜❝❱❬❪❞❬ ❴❩❭◗❘❱ ❵❭❪❬①❳❩❩✉q ⑨❱③ ❘❙❬❥

❯① ❘❙❬✉ ❵❭◗ ❱❬❬ ❱❯❥❯❩❭❪❯❘❯❬❱ ❜❪ ❣❯①①❬❪❬◗❵❬❱ ❝❬❘❫❬❬◗ ❴❩❭◗❘❱❨

①❜❪ ❬④❭❥❴❩❬ ❯◗ ❘❙❬ ❱❙❭❴❬ ❜① ❘❙❬❯❪ ❩❬❭❞❬❱q

⑩ ❶❬❩❴ ❩❬❭❪◗❬❪❱ ❘❜ ❩❜❜③ ❯◗ ❘❙❬ ❩❜❵❭❩ ❭❪❬❭ ①❜❪ ❥❜❪❬ ❬❞❯❣❬◗❵❬

❭❝❜❳❘ ❙❜❫ ❣❯①①❬❪❬◗❘ ❴❩❭◗❘❱ ❢❪❜❫ ❯◗ ❣❯①①❬❪❬◗❘ ❵❜◗❣❯❘❯❜◗❱q

❷❂✻❅ ✻❂✼❄✽❂❄✿ ✾❈

❀❂✈❂✻❈❅ ❄❂✿❅❂❸✾ ❇❈❄

✾❁❂❃❄ ❂✽✈❃❄❈✽❆❂✽✾ ❹❺

✻❈❈❻❃✽❋ ✼❇✾❂❄ ❅✻✼✽✾✿

✼✽❀ ❁✼✽❀✻❃✽❋ ✾❁❂❆

●❃✾❁ ❸✼❄❂✸

❼❽❾❿➀➁➂➃ ❼➁➄

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✻ ✶�✶ P✁✂✄☎✆ ✂✄✝ ☎✞✟✠✡ ☛✂✡☎✆

☞ ✳☞ ✥✌✍✎✏✑ ✍✎✒ ✏✓✔✕✖ ✗✍✖✏✑

✘✙✚✛✜ ✢✚✣✜✤

❯✦✧ ★✩✧ ✪✧② ✫♦✬❞✦ ★♦ ✭♥✮✦✩ ★✩✧ ✯✰✱✧✯✦

♦♥ ★✩✮✦ ♣✲✴✵✷✸❙✹✺ ✼✽✾ ✿✾✺ ❀❁❂❃❄ ❁❅✼ ❆❁❅❃

❀✽✾✇ ✺❁❅ ❀❂❇✼✾ ✼✽✾❡❈ ❉✼ ❀❇❆❆

✽✾❆❤ ✺❁❅ ❂✾❡✾❡❊✾❂ ✼✽✾❡❈

❘❋●❋●❍❋■❏

❑▲▼ ◆❖◗❚❱

❲❳❨❩❬❭ ❩❪❪❫ ❴❪❨❳❬❴❵

r❛❛❬❭❜ ❳❪❨✈❪❭ ❨❩❫

❭❬❪s❭ ❬❛ ❝r❛❢ ❢❪❳❳❣

✐❥❥❥❥❥❥❥❥❥❥

❦❥❥❥❥❥❥❥❥❥❥❥

❧❥❥❥❥❥❥❥❥❥❥❥❥❥❥

♠❥❥❥❥❥❥❥❥❥❥❥❥

qt✉①③④ t⑤✉⑥⑤⑦④ ⑦③⑤⑧④ ⑨⑩⑩③⑦④ ❶⑩❷⑤⑨⑦④ ⑦⑩❸t

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✶ ▲♦♦�✁✂✄ ☎✆✝❡✞ ✟✠☎✂✝✡ ✼

☛☞✌✍✎ ☞ ✏✍☞✎ ✑✎☞✒✓

❘✔✕✖✗✘❝✔✕

❨✙✚ ✛✜✢✢ ✣✤✤✥ ✦ ✧✤✦✢ ★✢✦✣✩ ✛✜✩✪ ✫✙✛✤✧s✬

s✙✭✤ ✩✪✜✣ ✮✦✧✥✬ s✩✜✮❞✯ ✩✦★✤ ✦✣✥ s✮✜ss✙✧s✰

✱ ▼✲✳✴ ✵✲✷✴✵✸ ✹✺✻ ✽✾✴ ✿✲✻✽✸ ✺✹ ✽✾✴ ✿✵✲t✽ ❀✸❁t❂ ✽✾❁t ❃✲✻❄❅

❆ ❯✸✴ ✸✽❁❃✳② ✽✲✿✴ ✽✺ ✸✽❁❃✳ ✴✲❃✾ ✵✲✷✴✵ ✺t ✽✾✴ ✿✵✲t✽❅

❇ P❀✽ ✲ ✵✲✷✴✵ ✹✺✻ ✽✾✴ ✻✺✺✽✸ ❁t✽✺ ✽✾✴ ❈❉❊❋❅

●❍■●❏ ❑❖◆◗ ❙■❚◗❱❲❱❳

❩ ✮✦✣ ✣✦✭✤ ✩✪✤ ✧✙✙✩s✬

s✩✤✭✬ ✢✤✦✈✤s ✦✣✥

✫✙✛✤✧s ✙❬ ✦ ★✢✦✣✩✰

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✽ ✶�✁ P✂✄☎✆✝ ☎✞✞✟ ✂✠✡☛✆ ✄☎✟ ☞✄✆✞❡

✌ ✳✍ ✥✎✏✑✒✓ ✑✔✔✕ ✎✖✗✘✒ ✏✑✕ ✙✏✒✔✚

✛✜✢✣✤ ✦✧★✩✦✤

▲✪✫✬ ✭✮✬ ✮ q✯✰✱✲✴✵✷✸

✹✺✻✼✾✿❀❁❂ ❃✿❄❅✾❂❆❛✾✻❇❂✿❁✈✻✼✾✿❄❛✾✿❀❁❂ ❇✻✼✺❃✾✼❂ ❅✻✿❄❅✾❂ ❄❇❀❆

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✶ ▲♦♦�✁✂✄ ☎✆✝❡✞ ✟✠☎✂✝✡ ✾

❍☛ ☞✌☛✍ ✎✏ ✐✑✈✒✓✔✐✕✖✔✐✗✑ ✥✌ ✘✏☞ ✌♥✥✙

❚✚☛✍☛ ✎✛☛ ✥✚☛ r✒✓✜✢✔✓ ✎✣✥☛✛ ✥☛✏ ☞✎②✍✙

✤ ❍✌✇ ✦✎✏② ✧☛✏✥★✦☛✥✛☛✍ ✥✎❛❛ ✎✛☛ ✥✚☛ ✩❛✎✏✥✍ ✏✌✇✪

P❛✎✏✥ ✫ ✬✬✬✬✬✬✬✬ P❛✎✏✥ ✭ ✬✬✬✬✬✬✬✬ P❛✎✏✥ ✮ ✬✬✬✬✬✬✬✬ P❛✎✏✥ ✯ ✬✬✬✬✬✬✬✬

✷ ❲✚✎✥ ☞✌☛✍ P❛✎✏✥ ✮ ✏☛☛☞ ✥✌ ✦✎✰☛ ★✥ ✚☛✎❛✥✚②✪

✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬

✸ ❲✚✎✥ ✥✇✌ ✥✚★✏✱✍ ☞✌ ✩❛✎✏✥✍ ✏☛☛☞ ✥✌ ✕r✗✲ ✇☛❛❛✪

✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬ ✎✏☞ ✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬

✹ ✳✴✐✑✵ ✖✺✗✜✔ ✐✔✻

❲✚☛✛☛ ☞✌ ✌♥✥☞✌✌✛ ✩❛✎✏✥✍ ✱☛✥ ✇✎✥☛✛ ✣✛✌✦✪

✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬✬

❈✼✽❈✿ ❀❖❁❂ ❃✽❄❂❅❆❅❇

■ ❉❊❋● ❏❑▼❏ ◆◗▼❊❏❘ ❊❙❙❯ ◗❱❳❑❏ ▼❊❯ ●▼❏❙❨❩

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✶� ✁✂✄ ❚r❛☎✆✝✞rt✟☎✠ ✡❛t❡r

☛ ✳☞ ✥✌✍✎✏✑✒✌✓✔✎✕ ✇✍✓✖✌

◆✗ ✘✗✗♦✙✚

✛ ❈✜✢ ✣ ✤✢✦✧ ★✩✪✧ ✣ ✫✬✣✭✢

✢✮✣✢ ✮✣✤ ✣ ✯✪✰✦✩ ✣✭✱

✤✪✧✦ ✬✦✣✈✦✤✲

✷ P✬✣✭✢ ✢✮✦ ✤✢✦✧ ✴✭ ✢✮✦ ✤✪✴✬

✴✭ ✢✮✦ ✫✬✣✤✢✴✐ ✐✜✫✲❨✪✜ ✭✪✰

✮✣✈✦ ✣ ✫✬✣✭✢ ✰✴✢✮ ✭✪ ✩✪✪✢✤✲

❘✵✸✹✺✻❝✵✸

✼✽✾ ✿❀❁❁ ❂❃❃❄ ❅ ❆✽✿❃❇ ✿❀❉❊

s✽❋❃ ❁❃❅●❃s❍ ❅ ■❁❅s❉❀❏ ❏✾■ ❅❂❄

s✽❋❃ s✽❀❁❑

▲ ▼✴✈✦ ❖✪✜✩ ✫✬✣✭✢ ✰✴✢✮ ✭✪ ✩✪✪✢✤ ✣ ✬✴✢✢✬✦ ✰✣✢✦✩ ✦✈✦✩❖ ✱✣❖✲

◗ ❙❯❱❲❳❩❬ ✰✮✣✢ ❖✪✜ ✢✮✴✭❭ ✰✴✬✬ ✮✣✫✫✦✭ ✣★✢✦✩ ✪✭✦ ✰✦✦❭ ✣✭✱ ✣★✢✦✩ ✢✰✪ ✰✦✦❭✤✲

❪❫❴❵❜❞❢❜❣❤

❥❦❧♠♥❦♣ q♥❥✉❧①♠♥q♣ ①♥②③④⑤q

⑥⑦⑧⑨ ⑩❶❷❷ ⑦⑧❸❸❹❺ ⑨❻ ⑨⑦❹ ❸❷⑧❺⑨❼

❽❾⑨❹❿ ❻❺❹ ⑩❹❹➀❼ ❽❾⑨❹❿ ⑨⑩❻ ⑩❹❹➀➁❼

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂➂

➃➄➄➅ ❽➆➇ ➃➈❽➉➆

➊➋➌ ➍➎➎➏➐ ➎➑ ➒ ➓➔➒→➏ ✣➣✤✪✩➣

↔➒➏➌➍ ➑➍➎↕ ➏➋➌ ➐➎➙➔

➒→➛ ✢✩✣✭✤✫✪✩✢ ➙➏

➏➋➍➎➜➝➋ ➏➋➌ ➐➏➌↕➞

➟➔➒→➏➐ →➌➌➛

➋➌➒➔➏➋➠ ➍➎➎➏➐

➒→➛ ➐➏➌↕➐ ➏➎ ➏➍➒→➐➓➎➍➏

↔➒➏➌➍ ➏➎ ➏➋➌ ➔➌➒➡➌➐➞

➢➤➥➦➧

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✶ ▲♦♦�✁✂✄ ☎✆✝❡✞ ✟✠☎✂✝✡ ☛☛

✺ ❉☞❛✇ ✇✌❛✍ ✍✌✎ ✏✑❛✒✍ ✑✓✓✔✎✕ ✑✖✔✎ ❛✗✍✎☞ ✓✒✎ ✇✎✎✔ ❛✒✕ ❛✗✍✎☞ ✍✇✓ ✇✎✎✔✘✳

✥✙✚✛✜✢✚

✻ ❲✎☞✎ ✣✓✤☞ ✏☞✎✕✖✦✍✖✓✒✘ ✦✓☞☞✎✦✍✧ ★★★★★★★★★★★★★★★★★★★★★★★★★

❚✩✪✫✬ ✭✮✯✰✱ ✪✱✲

✼ ❲✌✣ ✕✓ ✏✑❛✒✍✘ ✒✎✎✕ ✌✎❛✑✍✌✣ ☞✓✓✍✘ ❛✒✕ ✘✍✎✴✘✧

❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴

✽ ❊✵✏✑❛✖✒ ✇✌❛✍ ✌❛✏✏✎✒✎✕ ✍✓ ✍✌✎ ✏✑❛✒✍ ✇✖✍✌ ✒✓ ☞✓✓✍✘✳

❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴

❈✷✸❈✹ ✾❖✿❀ ❁✸❂❀❃❄❃❅

■ ❆❇❋● ❍❏❑❍ ▼❋❋❍◆ ❑P◆❋▼P ●❑❍◗▼ ❘▼❋❙ ◆❋❯❱❳

■ ❆❇❋● ❍❏❑❍ ❨❱❑❇❍◆ ❇◗◗❩ ❏◗❑❱❍❏② ▼❋❋❍◆ ❑❇❩ ◆❍◗❙◆ ❍❋ ❬▼❋● ●◗❱❱❳

❭❤❪❫ ❤❪❵❵❜❝❜❞ ❫❢ ❫❤❜ ❵❣❪❝❫✐

❥❦❫❜❧ ❢❝❜ ♠❜❜♥✐ ❥❦❫❜❧ ❫♠❢ ♠❜❜♥♣✐

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✶� ✁✂✄ P☎✆✝✞ ✟✠♦✇✞✡ ✆✝☛ ✞❡☞✌❡✠✆✞❛✠❡

✍ ✳✎ ✥✏✑✒✓ ✔✕✖✗✓✘ ✑✒✙ ✓✚✛✜✚✕✑✓✢✕✚

❲✣✤✦ ✧★ ✦✣✩ ✦✩✪✫✩✬✤✦✭✬✩✮

✯ ❋✰✱✱ ✰✲ ✴✵✷ ✱✸✹✷✱✺ ✻✼✽ ✷✸✾✵ ❤✰✾✴✿✽✷❀

❁ ❚❂❃❄❅ ❆❇❈❉❊ ❃❊●

❍✵✸✴ ■✼✿✱❏ ❑✼✿ ❏✼ ✴✼ ✵✷✱❤ ▲✱✸✲✴ ▼ ◆✽✼■❖

❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴❴

◗❘❙◗❯ ❱❳❨❩ ❬❙❭❩❪❫❪❵

❜ ❝❞❢❣ ✐❥❦✐ ❧♠❦❞✐♥ ♣❦❞ qr ✐❢❢ ❥❢✐ ❢s ✐❢❢ ♣❢♠t✉

✈①②③④⑤④②✈②③ ⑥⑦⑧⑨ ⑩❶❷❸❹ ⑧⑨ ❹❺❺ ①⑤✈❻ ⑥⑦⑧⑨ ⑩❶❷❸❹ ⑧⑨ ❹❺❺ ❼⑤❽❾❻⑥⑦⑧⑨ ⑩❶❷❸❹ ⑧⑨ ❿➀③④❻

➁❽➀➂✈ ➃ ➁❽➀➂✈ ➄ ➁❽➀➂✈ ➅

➆➇➈➉➇➊➋➆➌➊➇➍ ➆➎➇➊➈➏➈➇➆➇➊➍➎➏➆➍➐➋➊➈➍➑➏➒➓