Snow

Cool facts about snow
What is 15 inches wide, eight inches thick and made of billions of water molecules? If you guessed the world's largest snowflake, you are right! Most snowflakes are very small and are less than half an inch wide. However, a snowstorm in Fort Keogh, Montana, on January 28, 1887, produced this record 15-inch snowflake.
While some parts of the world never see snow, the white stuff permanently covers about 10 percent of the earth's surface. For snow to fall, the temperature must stay very cold. Snow forms when the water inside a cloud freezes.
Snowflakes are groups of ice crystals that fail from a cloud. Many people believe that every snowflake is unique. However, scientists have discovered two snowflakes that look exactly the same. In addition, snow is not really white - it's clear!
Different factors in the environment can also make the snow look blue, green, yellow or even pink! With all of the different colors and designs, snow really is a work of art!

Grammar Gym
[part A] for something to happen in [part B] something else must happen
* For snow to fall, the temperature must stay very cold.
=> The temperature must stay very cold for snow to fall.
* For Mary to make her special cake, there must be something important to celebrate.
* For the package to not be late, you must mail it before tomorrow.

Language Tips
billion n.十億   million n.百萬
billionaire n.億萬富翁  millionaire n.百萬富翁
* These defensive weapons cost billions of dollars.
這些防禦性武器價值幾十億美金
permanently adv.長久地、固定不變地    n.燙髮
permanent adj.長期的、固定的、永久的
* Brenda was permanently crippled by the accident.
Brenda因為這場車禍，這輩子都跛著腳了。
* This is my permanent address.
這是我的固定的地址
in addition 另外、除此之外
* Not only can I earn money working in this restaurant, inaddition, I get free dinners.
我在這家餐廳工作除了能賺錢，另外，可以得到免費的晚餐。
work of art藝術品、像藝術品的創作
* The playwright's witty dialogue is a work of art.
這位劇作家風趣的對話，真是一件藝術作品。
* The Christmas tree at the Johnsons' is a work of art.
Johnson家的聖誕樹是一件藝術品

Info Cloud
snowflake n.雪花
* You're not a unique snowflake.
別以為你是與眾不同的人(有負面含義)
flake n.不負責的人、怪僻的人
* He is a real flake.
他真是一個靠不住的人
flaky adj.靠不住的、不負責的

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http://www.its.caltech.edu/~atomic/snowcrystals/photos/photos.htm