Children's Encyclopedia1976 |
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Pàgina 10
... breathe . But air is vital to us in other ways . It helps shield us from dangerous rays that come in from outer space . Like a blanket , it keeps the earth warm at night and shields us from the sun's fierce heat during the day . The air ...
... breathe . But air is vital to us in other ways . It helps shield us from dangerous rays that come in from outer space . Like a blanket , it keeps the earth warm at night and shields us from the sun's fierce heat during the day . The air ...
Pàgina 29
... breathe under water . But even so the water spider builds its home in a pond . First it jumps on the water and catches a bubble of air . Then it dives down and makes a silk web among the waterweeds . It fills the web with bubbles of air ...
... breathe under water . But even so the water spider builds its home in a pond . First it jumps on the water and catches a bubble of air . Then it dives down and makes a silk web among the waterweeds . It fills the web with bubbles of air ...
Pàgina 30
... Breathing When you run fast , you sometimes get out of breath . This is because your muscles have used up their oxygen . Oxygen is a gas and is part of the air we breathe in . Without it our bodies can- not work . * The lungs can hold ...
... Breathing When you run fast , you sometimes get out of breath . This is because your muscles have used up their oxygen . Oxygen is a gas and is part of the air we breathe in . Without it our bodies can- not work . * The lungs can hold ...
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