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听力文摘:岩石怎么会出现在你的花园?

时间:2020-08-20 09:15来源:互联网 提供网友:nan   字体: [ ]
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    (单词翻译:双击或拖选)

How Rocks Appear In Your Garden

I wonder how many of us went out this past spring to get our gardens ready for planting, smug in the thought that last year we got rid of all the rocks.

There’s that nice big mound1 of them in the corner of the garden where we piled them. Surely by now they are all cleaned out.

“Wait! What is this?!” A big stone, and another one, and another one! Where did they come from?

Did some mischievous2 kid bury a bunch of them for me to find this spring? Well, that could be,But maybe this time the kids were actually innocent.

Any place that has winters cold enough to freeze the ground might experience the magical appearance of rocks welling up from beneath the surface.

This is so common in the eastern U.S. that the rocks are called “New England potatoes.”

Here’s what makes these stones mysteriously appear. Stones are better conductors of heat than soil, so the stone conducts heat away from the warmer soil beneath it.

That colder soil under the rock then freezes before other dirt at the same depth.

Remember that when water freezes it expands. So, when the water in the soil under the rock freezes, it expands and pushes the rock up a little.

When the ground thaws3 a space is left under the stone which fills with dirt, so the stone rests a little higher.

Over a period of time this repeated freezing, expanding, upward push, and filling underneath4 eventually shoves5 the rock to the surface.


点击收听单词发音收听单词发音  

1 mound unCzhy     
n.土墩,堤,小山;v.筑堤,用土堆防卫
参考例句:
  • The explorers climbed a mound to survey the land around them.勘探者爬上土丘去勘测周围的土地。
  • The mound can be used as our screen.这个土丘可做我们的掩蔽物。
2 mischievous mischievous     
adj.调皮的,恶作剧的,有害的,伤人的
参考例句:
  • He is a mischievous but lovable boy.他是一个淘气但可爱的小孩。
  • A mischievous cur must be tied short.恶狗必须拴得短。
3 thaws 4f4632289b8d9affd88e5c264fdbc46c     
n.(足以解冻的)暖和天气( thaw的名词复数 );(敌对国家之间)关系缓和v.(气候)解冻( thaw的第三人称单数 );(态度、感情等)缓和;(冰、雪及冷冻食物)溶化;软化
参考例句:
  • The sun at noon thaws the ice on the road. 中午的阳光很快把路上的冰融化了。 来自辞典例句
  • It thaws in March here. 在此地化雪的季节是三月。 来自辞典例句
4 underneath VKRz2     
adj.在...下面,在...底下;adv.在下面
参考例句:
  • Working underneath the car is always a messy job.在汽车底下工作是件脏活。
  • She wore a coat with a dress underneath.她穿着一件大衣,里面套着一条连衣裙。
5 shoves e89e54ac81f8eab44bcb7cdd88683085     
推,猛推,乱推( shove的第三人称单数 ); 乱放; 随便放; 胡乱丢
参考例句:
  • Then she folds her notes, shoves them in her pocket. 然后,她折叠好笔记本,把它塞在口袋里。
  • Grace picks up a jug that's partially filled, shoves another one under the tap. 格雷斯搬起一只没装满水的罐子,使劲把另一个罐子推到水笼头下面。
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