Page 8 - 新思维科学学生用书3 样章
P. 8
Working like a scientist
Fair testing
Fair testing allows you to see how
changing just one thing affects
something else. You change one
thing then observe or measure
what happens to the other thing.
You must keep all the other things
the same.
In my fair test I changed the plastic only.
I observed only how it blocked the light.
I kept everything else the same.
This is the best plastic
for sunglasses.
Observing over time
You can answer some science questions by observing
over time.
By observing seeds grown with different amounts
of water Sofia can answer this question: How does
the amount of water affect the growth of plants?
Sofia is observing the effect of
watering over time.
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