D230【Snow】V-learn小西妈双语工程1907期112Eric20.11.23打卡

宝贝疙瘩蛋

雪花

生长

雪景

下雪

放学

不同

凝结

校园

起床

欣赏

2020年11月23日，第一场雪，赶紧high起来。早上起床都不用闹钟，一听到说外面有雪，立马起床说要出去玩雪，答应他放学回来再一起玩雪。 早上上学路上，玩打雪仗，揉雪球攻击妈妈，被我抓拍到。

晚上放学，雪已经停了，路面上也没有积雪，晚饭后跟爸爸去停车场的车上搜集了一盆带回家，一起先做个雪人玩吧。

品尝雪，观察雪，尬聊几块钱的，哈哈。

补充：昨天刚开始下雪的时候跟Eric想起了snowflake的儿歌，小家伙看见下雪非常兴奋。

校园雪景欣赏1

校园雪景欣赏2

*************All about snow******************************* 雪花形成过程详解。

* What is Snow?

Snow are small flakes of ice that fall down to the earth. Snow is a form of precipitation like rain and sleet. It snows when water in the atmosphere freezes into crystals. These tiny ice crystals form together to make snowflakes. To snow the temperature must be below 32 degrees.

*How Big is a Snowflake?

The size of a snowflake depends on how many ice crystals connect together. Each snowflake is made up of about 200 ice crystals. Snowflakes have six sides. Many people say that no two snowflakes are exactly alike, however there is no scientific proof of this.

• Water molecules condense onto the surface of the particle,and then onto each other in a hexagonal lattice formation. 水分子凝结在粒子的表面，然后以六边形格子的形式相互凝结。
  
• The hexagonal plate grows into a prism.Different facets grow at different rates,depending on the conditions. 六角形板长成棱柱。不同的面根据条件以不同的速率生长。
  
• Branching instabilities causes arms to grow on the corners.These grow faster than the rest of the crystal and becomemore pronounced.分支不稳定性导致臂在角上生长，它们比晶体的其余部分生长得更快，并且变得更加明显。
  
• The snow crystal is then blown into a new setof conditions which favour plate growth again.The variablility of conditions experienced byeach crystal accounts for the complexity offorms seen. 然后将雪晶吹入新的一组条件中，这又有利于板块的生长。每种晶体所经历的条件的易变性解释了所看到的形式的复杂性。
  

* What do Snowflakes Look Like?

Did you know that each snowflake is completely different to the next? Well amazingly they are. They all have a geometrical shape made up of five points.

When snowflakes collect, the snow gets packed together. Because its own weight they squeeze out the air from the middle of the flakes.
不同的雪花造型。 ------------------------------------------------------------
Q1： is snow just frozen rain?
Nope. Rain is a simple drop water, but snow forms when little bits of clouds go from being wet air to ice (and skip the whole “drop of water” phase, but you can explain sublimation to them another time). Rain forms in all sorts of clouds, but snow only forms in really cold ones, usually around 20 degrees in the top portion of the cloud. That’s where a lot of the bouncing around happens that turns the air to ice; how the ice bounces around determines if the snow falls as a tiny little pebble of ice or as one of those crazy looking snowflakes.

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Q2： no 2 of those are alike, right?
Well … about that. All snowflakes are alike in that they have 6 sides, because their skeletons are 6-sided (by “skeleton” you mean “molecular level,” in the event that you’re already raising a chemist who understands those things). As the flake drops through the cloud, more wet air freezes around each side, and since no 2 snowflakes take the same route to the ground, they all form a little differently. But no one can say for sure that no two are ever alike because they keep melting before anyone can check.

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Q3：Why is snow white?
Since snow is really just fancy little bits of ice, it reflects light the same way a frozen pond might. But a frozen pond is one big reflecting surface; a snowflake or snow pebble has roughly a gazillion surfaces, all pointed every which way. Each surface reflects the color of whatever it's pointed at, but when there's that many different colors being reflected all at once, all you can see is white. It's like when it gets so loud in the car that you can't hear your mother, except its your eyes that get overwhelmed instead of your ears.

*How to Make Paper Snowflakes at home

What You'll Need:
8.5-by-12-inch paper
Scissors
Pencil
Steps：
1. Fold Your Paper
The easiest way to cut the paper into a perfect square is first to fold one corner of the paper to meet the opposite edge, creating a triangle and a rectangle. Then, fold the rectangle into the center, creasing along the edge of the triangle.
2. Cut a Square
Open up the piece of paper and cut off the rectangle.
3. Fold Again
Fold your paper diagonally, creating a triangle, then fold it in half again to form a smaller triangle.
4. Fold Into Thirds
Fold the triangle into thirds, being careful to line up the left and right edges of the paper. Trim off the bottom points by cutting along the horizontal edge.
5. Design Away
With the paper still folded, create your paper snowflake design. Experiment with different shapes, sizes, and styles to create a variety of designs and patterns. Have fun with it!
6. Cut Carefully
Cut out your paper snowflake pattern, making sure to keep some of the folded edge intact, or else your snowflake will fall apart.
7. How to Make Paper Snowflakes, Final Snowflake
Carefully unfold the paper to reveal your unique paper snowflake. And that's it! Now you have festive paper snowflakes you can use as creative touches for wrapping holiday gifts, winter wonderland home decor, or any other idea you can think of for your new beautiful creations.

积木块搭建不同形状的雪花。 剪纸雪花，自己设计图案，猜猜哪个是Eric做的。 Fun Facts about Snow
 A blizzard happens when cold air sits near the Earth’s surface, while warm air sits above it. This mix of air combined with lots of moisture makes a blizzard. Blizzards bring snow, strong winds and cold temperatures. They can last for several days.
 Sleet is tiny rain particles that freeze on their way down. Brrr!
 Have you ever noticed a thin, white layer of ice crystals on the ground in the fall? This is frost. It happens when the air temperature drops below freezing and water droplets freeze.
 On average snowflakes fall from the sky at 3-4 miles per hour.
 Close to 80% of the worlds fresh water supply comes from snow and ice.