There are some places where you can expect wildfires. In California, fires burn from 50,000 to 500,000 acres of land every year. Some of the plants A have oily sap. They can survive the dry, hot summers, but if they catch fire they explode into flame. Grasses grow thick during the spring rains and then die. They dry into a thick layer of straw B, making a very hot fire.
Fires can start wherever there’s fuel to burn. Southern California has plenty of fuel and a hot, dry wind C between mid-September and late October. This wind, called the Santa Ana, passes over the inland desert, D, and rushes toward the ocean to the west. The Santa Ana wind fans the flames and makes fighting the fires nearly impossible.
In 1988, Wyoming’s Yellowstone National Park was burned by several fires at once. Lightning struck in two places. A worker dropped a lit cigarette in another place. On the worst day of fire, more than 600 square kilometers of forest burned. Clouds of smoke E rose into the atmosphere. Smoke blocked the sun and drifted far beyond the park.
Firefighters work hard to control fires like those in Yellowstone and California, F. But long before humans learned how to start or put out a fire, prairies and forests burned every year. Both kinds of land recovered, as they have in Yellowstone and in California.
1. that burns fast
2. many of which are caused by people
3. that blows every year
4. wherever lightning strikes
5. that looked like storm clouds
6. that live there
7. its air losing moisture and gaining heat
да
Объяснение:
Изучение Африки европейцами — изучение Африки европейскими путешественниками. Знакомство европейцев с Африкой началось ещё в античности. Античные путешественники изучали Северную Африку; при этом собственно Африкой или Ливией считали континент за пределами Египта, который считался частью Азии. Исследования Африки южнее Сахары активно продолжились в эпоху географических открытий (начиная с XV в.). Основную роль играли португальские мореплаватели: так, Бартоломео Диас в 1488 году достиг Мыса Доброй Надежды, открыв морской путь в Индию и на Дальний восток. При этом знакомство с внутренней частью континента в XVI, XVII и первой половине XVIII вв. оставалось незначительным: основную роль в нём играли работорговцы. В начале XIX в. сведения европейцев об Африке южнее Сахары оставались незначительными. Исследования Южной Африки активно продолжались в 1830-1840 годах, и активно развивались во второй половине XIX вв. во время колониального дележа континента. Большую роль в этом процессе играли поиски истоков Нила.
- Tom, would you like to join one of the youth movements?
- For example?
- What do you think about "The Green Movement"?
- Well, maybe. I like nature. What about you?
- Me too. I'm sure that it cannot protect itself from such a greedy species as human beings. It needs help.
- Absolutelly agree with you.
- What about another movement? It is called "Young people for Peace"
- Nice name and great goals it has, I guess. Every sensible person on the Earth wants to live in peace. Me too.
- That's right. I've heard about one more movement - The Stay Healthy Monement.
-Oh, souds great. I'd like to to take part in it. I'm for healthy life. I'm really against smoking, drinking, drugs and so on.
- I think I'll join this movenemt. Are you with me?
- I'll think.
- ok. They have a meeting tomorrow at 6 pm. I'm going. We could come together.
- I'll call you tomorrow after a considerate thought about it. Talk to you tomorrow. I need to go now.
- Bye, till tomorrow.