Our place in space 英语演讲资料.pptVIP

Level: BEGINNER Name: Charles Galaxy There are approximately four hundred million galaxies in the universe. the Milky Way We can see a small part of our galaxy, this is the Milky Way star There are three billion stars in the Milky Way. The sun is one of the stars. Eight planets There are nine planets around the sun. The Earth and the moon The earth is the third planet from the sun. The Earth has one natural satellite—the moon. The moon is only a quarter of the size of the earth. Approximately a querter of the earth’s land surface is more than 3000 feet above sea level. Most of Antractica is about 6000 feet high. Most of Tibet is 15000 feet high. The highest capital city in the world is La Paz, in Bolivia. It is about 12000 feet high in the Andes. There is not a lot of oxygen high up in the mountains. People and animals in there have bigger hearts and lungs than most people. It is also very cold high up in the mountains. The temperature will drop a lot.Two degrees Centigrade is the same as 3.6 degrees Fahrenheit. Rain forests near equator Rain forests cover about six percent of the earth’s land surface. The are mainly on or south of the equator. There are rain forests in New guinea, Malaysia ,Indonesia, and South America . Rains a lot It rains nearly every day in the forests. The temperature seldom under 26 degrees Centigrade. The air is 80% moisture. Get medicines from the forests We get some of our most common medicines from rain forests:quinine and aspirin from tree bark, cough medicines from tree resin. The nature is wonderful. Everybody must certainly protect it well * * * * *