P5 Sci word box revision 1

Which gas is less than 1% in the atmosphere but important to plants?

What simple machine does nutcracker belong to?

which experiment in unit 1 shows the air takes up space?

• wait for a burning candle in a jar to be put off

• put an upside-down cup with dry paper inside into water

• burn a wooden splint

which kinds of the pulley can save force but not changing the direction of using effort?

What force between my shoe and the floor makes me walk?

The hot air on land goes upward, the air from the shore goes ____________ to the land.

• upward

• downard

• inward

• outward

which one is noise defender?

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Which of the following tools is the 1st class lever?

• scissors

• nutcracker

• fishing rod

• chopsticks