UNIT 8 Worksheet I Name and surname: ..................................................................................................................................... Form: ...................................................................... Date: ....................................................................... COMPOSITION AND STRUCTURE OF THE ATMOSPHERE A Are the following sentences TRUE (T) or FALSE (F)? I. The most abundant gas in the atmosphere is oxygen. II. The gas needed for plants’ photosynthesis is oxygen. III. Nitrogen represents 78% in volume of gas in the air. IV. The percentage of water vapour in the atmosphere is always constant. V. In the atmosphere there is a small proportion of other gases, such as helium, neon, ….. B Write correctly those sentences you thought were incorrect in the previous activity: .................................................................................................................................. .................................................................................................................................. ................................................................................................................................. ................................................................................................................................. .................................................................................................................................. ................................................................................................................................. C Fill in the blanks: The atmosphere has …………………………………. layers. The highest layer is the …………………………………….., where the aurora borealis takes place. The © ANAYA ENGLISH. Grupo Anaya, S.A. Photocopiable next layer is the ………………. and there meteorites disintegrate, producing what are called ……………………… ……………………… The stratosphere is a layer inside of which there is an area called the ………………………………, where a gas ,…………………………………………, is abundant. This gas is of vital importance because it absorbs the ………………………………. rays of the Sun, which are harmful. The inner layer is the ………………………………………….., where ………………………………………… phenomena take place and where all living beings of the Earth can be found. 123 Unit 8. Worksheet I Name and surname: ..................................................................................................................................... D How many litres of oxygen are there in a room which has 9 square metres of surface and is 2 m high? Explain your calculations. ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... E Fill in the blanks in the picture. Write in the arrows (I, II, II, IV) the name of the corresponding layer of the atmosphere; in the blanks on the left (V, VI, VII) the altitude of each of them; and on the blanks on the right (VIII, IX, X) the name of the limit between each layer. High energy solar radiation Spaceships in orbit Aurora borealis Satellites I. VIII. – 90°C V. Shooting stars II. IX. 0 °C VI. Ultraviolet radiation III. Nuclear bomb cloude Ozone layer X. VII. 8 km IV. Air temperature _ 100 °C 124 Everest mountain (8864 m) 0° 15° +100 °C © ANAYA ENGLISH. Grupo Anaya, S.A. Photocopiable Cosmic rays Unit 8. Worksheet I Name and surname: ..................................................................................................................................... F Identify the following images. In each column write down the name of each of them and of the layer of the atmosphere where they are found. I. ............................................. II. ............................................ III. ............................................ © ANAYA ENGLISH. Grupo Anaya, S.A. Photocopiable ........................................ ........................................ ........................................ IV. ....................................................................... V. ............................................................... ............................................................ ....................................................... 125