书城教材教辅科学读本(英文原版)(套装1-6册)
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第2章 第一册(2)

"He piled up the sawdust in a heap in the saucer, and then tried to do the same with some water in another saucer.""But, of course, he couldn"t do it," said Willie, "because you can"t make water stand up in a heap. It always keeps a flat or level surface.""Yes; and, when it got to the top of the saucer, it ran away over the sides, and on to the table," added Fred. "We saw it flow along the table, and fall down to the ground.""Why, of course," said Norah, "water always flows down. We can see it flow down, if we turn on the tap. It never flows up.""Teacher told us to think of the rain, too," said Willie. "The drops of rain always fall down-never up.""I can show you some drops of water." said Fred. "Look; I dip this brush in the water, and shake it. The water will fall from the brush in little round drops."SUMMARY

We cannot pile up water in a heap; it always keeps a level surface. Water breaks up into little drops, and flows about. Water always ?ows down.

Water-A Liquid

Norah"s mother called her away to mind the baby, before the boys had told her all about their lesson.

She came back as soon as she could, and they began to chat again.

"I wonder whether Norah forgets what we learned about water," said Fred.