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| Getting
Started Health and Safety |
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| Aconcagua (say ah-cone-CA-wa) Aconcagua is the highest mountain in South America--22,834 feet/ 6960 meters tall! That's more than 16 times higher than the biggest buildings ever made by man. |
![]() aconcagua |
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| aerobic
exercise (say air-OH-bick) The kind of exercise that makes you lose your breath. Some examples are running, bike riding, swimming, hiking and skiing. Aerobic exercise is very good for you. |
aerobic exercise |
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| Appalachian
trail (say app-uh-LAY-chen trail) Trail that runs from Maine to Georgia. The Appalachian Trail runs for about 2160 miles/360 kilometers and it takes several months to hike from one end to the other, but many people have still done it. What about you? |
![]() appalachian trail |
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| air pressure The amount that air pushes on you. Yes! Air has weight and it pushes down on you from all directions--and your body pushes back. As you go higher into the mountains, the air pressure changes and you feel different because of it. Most importantly, it becomes harder for you to breath the same and you get out of breath more easily. |
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| alpine Place or thing that is very much like the Alps or the way things are in the Alps. Usually this means a place that is very high up with very little trees growing. Places like this have long, long winters, short summers and a lot of snow--and the air feels thin because you are so high up. Something that originally came from the Alps, too--like downhill skiing--can be called alpine. Sometimes downhill skiing is called Alpine skiing, because it originally came from there. |
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| Alps The highest mountains in Europe and the place where you find the Matterhorn. Mountain climbing started in the Alps. |
![]() Matterhorn |
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| altitude A word that means height, but usually only when talking about really big things, like mountains. |
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| altitude sickness Sickness caused by being too high. Usually it only causes a headache and an upset stomach. Drinking more water often makes it go away. Sometimes, though, you have to go lower on the mountain for the sickness to go away. |
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| Andes (say ANN deez) The highest mountains in South America, and the second highest mountains in the world. |
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anorak |
![]() anorak |
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Antarctica Continent at the South Pole. Antarctica is very cold and snowy, and not many people live there, but a lot of penguins do! |
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| Arctic Northernmost part of the world. There is an Arctic Ocean and an Arctic Circle. Some animals who live in the Arctic are polar bears, arctic leopards and arctic hares. |
![]() arctic hares |
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aspen |
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Aurora Borealis The Aurora Borealis is a "light show" of bright colors in the sky that happens mostly close to the North and South Pole. Also called Northern Lights. |
![]() aurora borealis |
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| avalanche (say AV-uh-lantch) Giant rush of snow coming down a steep slope. Avalanches are very dangerous and can bury people and whole buildings under huge amounts of snow. Avalanches are much more likely to happen in some places than in others, and also at certain times--mostly in the spring, when melting snow becomes very heavy, and after big snowfalls. |
![]() avalanche |
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