Описание презентации по отдельным слайдам:
Project Did you know.
Rain. When water vapour rises in the air it cools and then condenses into fine water droplets around very small particles. This may occur when the air rises over a mountain, or when it is in a depression, or this may take place when there are strong upward currents of warm air. The cold makes more and more water vapour change to water droplets. There are so many tiny droplets that they join and form larger drops. The drops get larger and heavier all the time. When they are too heavy to float in the air, rain drops to the ground, but the very fine raindrops remain as cloud. The raindrops vary greatly in size. Thunderstorms may have large raindrops, but in the mountains we may have fine rain. If the air is very cold, snow or hail may fall instead of rain.
What is an Iceberg? An iceberg is a mountain of ice in the sea. It was once a part of a glacier. But it broke off when the glacier reached the edge of the ocean. Although the ocean is salty the ice of an iceberg has no salt in it. An iceberg is made of fresh water that comes from the glacier. An iceberg is born in a very cold place. It can weigh a million tons. It floats out to a warmer area where it begins to melt. For about three years, it keeps travelling and melting little by little. Eventually, it gets very soft, breaks into pieces, and melts away completely. Most of the iceberg’s ice is under the water. What people see is just the top of the ice about the water.
Snow. Most clouds in the cooler regions of the earth have ice crystals in their upper parts. Water from the air condenses on the cool surfaces of the ice crystals and freezes. The process continues until the ice crystals have changed into snowflakes large enough to fall. Most often the snowflakes melt as they fall to earth. In this case, they hit the earth as rain. If the air is cold all the way to the ground, however, snow falls. Each snowflake is a tiny bit of ice. It has six sides or six points, but the design of each one is different. No two are ever exactly alike.
Hail. A cloud is made of millions and millions of water droplets. The air above the earth is cooler than the land. The higher air goes, the colder it becomes. Some clouds are so high that the drops in these high clouds freeze. They become small bits of ice. The bits of ice start to fall. Air From the earth carries them up again, high into the cloud. More water gathers on the ice. The water freezes again. Now there is a second layer of ice. The ice falls, but still it does not reach the earth. Air carries the ice up again, high where it is cold. Another layer freezes. After some time, the ice is so heavy it falls to the earth. We call the ice a hailstone. Hailstones may be as big as golf balls- even bigger. Hailstones are not really stones. They are pieces of ice. If you break a hailstone in two you can see the layers of ice.
Geysers. A geyser is a special kind of hot spring. Its water gets so hot underground that it boils and explodes into steam. The geysers spurts the hot water and steam into the air from an opening in the ground. The water shoots up like a fountain for a while, and then dies down. The water in some geysers rises only a couple of inches. In others, it shoots as high as a ten-story building. Some geysers spurt only once every few years.
Fact File. Name What are the seasons? What’s the weather like? What’s the temperature? How often does it rain? Cherrapunji (India) Wet season (summer) – May to September Dry season (winter) – October to March Cloudy and wet Sunny 20….300C 16….250C It rains almost every day, heavy rain. There’s no rain for weeks Atacama desert Summer- October to March Winter- April to September Windy and warm Cool, cloudy 14….270C 0…..250C In some places it rains only once every 100 years El Aziza desert Winter- May to September Summer- October to April Warm, sometimes hot Sunny and hot 20…250C 40…500C max. 580С Occasional rain in winter The North Pole Winter- November to March Summer- March to November Very cold and windy Cloudy, foggy and warm in June and July, sometimes sunny and hot, wet and cool in August and September -30…-450C 0…250С It often rains from April to September. The South Pole Winter- March to November Summer- November to March Very cold, windy, stormy Cold, windy -60…-850Сmin.-910С -40…-600С It never rains.
Did you know that. Hurricanes are very damaging. They can destroy a city in minutes. Hurricanes are given girls’ and boys’ names. Atlantic hurricanes are given their names in alphabetical order from the beginning of the season. This makes them easier to identify.
Did you know? The Snow Castle of Kemi is the biggest snow castle in the world. It is rebuilt every winter with a different type of architecture. About 300,000 people visit it every year in Kemi, Finland. The area of the castle is between 13,000 and 20,000 square metres. The highest towers are over 20 metres. Some of the walls are over 1,000 metres long. The snow castle has a chapel, a restaurant and a hotel. The Snow Restaurant has ice tables and seats covered with reindeer fur as well ice sculptures.
Do you Know? Summer in Australia begins in December. December, January and February are summer months. People often celebrate Christmas on the beach.
|Включите уведомления прямо сейчас и мы сразу сообщим Вам о важных новостях. Не волнуйтесь, мы будем отправлять только самое главное.|