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Smooth balls of ice rolled ashore on a beach in Finland and piled up like a huge bunch of turtles' eggs. But where did these “ice eggs” come from?

Amateur photographer Risto Mattila stumbled upon the strange sight while walking with his wife on Hailuoto Island. The temperature remained around minus 1degree Celsius that day, he said, and the wind blew quickly across the beach. “There we found this amazing phenomenon. There was snow and ice eggs along the beach near the water line”.

The “ice eggs” littered an area the length of about one-quarter of a football field and ranged in size from that of an average chicken egg to that of a powerful soccer ball. Mattila took a photo, noting that he had “never seen anything like this during 25 years around here.” Others came upon the ice eggs, too. “I've never seen this before. The whole beach was almost full of these ice balls,” said Tarja Terentjeff, who lives in the nearby town of Oulu. Another local, Sirpa Tero, told CNN she’d seen snowballs line the shoreline before, but not over such a large area.

“Although it happens once in a blue moon, these ice eggs form similarly to sea glass or rounded stones that wash up on the beach.” said BBC Weather expert George Goodfellow. Chunks(块) of ice break off from larger ice sheets in the sea and either slide to shore on the incoming tide or get pushed in by strong spells of wind at the water' s surface, he explained. Waves buffet(冲击) the ice chunks as they travel, slowly eroding their rough edges into smooth curves. Seawater sticks and freezes to the forming eggs, causing them to grow like snowballs do as they roll across the ground, leaving behind nothing but smooth and shiny “eggs” for curious tourists to happen upon.

1.The underlined phrase “stumbled upon” in Paragraph 2 can be best replaced by_    _

A.pulled through B.survived from

C.ran across D.took notes of

2.What can we know from Paragraph 3?

A.It was a very unusual phenomenon. B.Ice eggs gathered in a football field.

C.Only a quarter of the area was stricken. D.The beach was completely ice-covered.

3.According to Goodfellow, how did the “ice eggs” come into being?

A.By means of sea water buffeting the wood chunks.

B.On the basis of the strong force of the cold wind.

C.By way of the special location and cold weather.

D.Through a rare combination of weather and waves.

4.What does the text mainly talk about?

A.An extraordinary trip of “ice eggs”. B.The power of wind and seawater.

C.A strange weather-based occurrence. D.How snowball affected the shoreline.

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