UNIT 4 : THE ATMOSPHERE 1º ESO NATURAL SCIENCES

UNIT 4 : THE ATMOSPHERE

The Earth's atmosphere is a thin layer of gases that surrounds the Earth. It composed of 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and trace amounts of other gases. This thin gaseous layer insulates the Earth from extreme temperatures;; it keeps heat inside the atmosphere and it also blocks the Earth from much of the Sun's incoming ultraviolet radiation.

The atmosphere is divided vertically into four layers based on temperature: the

troposphere, stratosphere, mesosphere, and thermosphere. Troposphere: All of the earth's weather occurs in the troposphere. Stratosphere : The ozone layer protects the Earth from ultraviolet solar radiation. The

stratosphere is characterized by a slight temperature increase with altitude and the absence of clouds.

Mesosphere : The mesosphere is characterized by temperatures that quickly decrease

as height increases. Thermosphere : In the thermosphere, temperature increases with altitude. The

thermosphere includes the exosphere and part of the ionosphere. Exosphere : The exosphere is the outermost layer of the Earth's atmosphere.

ACTIVITITIES

1. Say if the next sentences are True or False. Correct the sentences in your notebook

a. The most important gas in the atmosphere is the oxygen. b. Weather conditions happen in the Stratosphere c. Ozone layer is in the Stratosphere d. The most important gases in the atmosphere are hydrogen and oxygen. e. Stratosphere is the closest layer to the Earth f. The exosphere is between the stratosphere and the mesosphere g. The ionosphere is included in the thermosphere

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UNIT 4 : THE ATMOSPHERE 1º ESO NATURAL SCIENCES

2 Make correct sentences with this words.

a. life, Ultraviolet, harmful, for, solar, is, human, radiation b. Stratosphere, closer, than, is , Troposphere. c. The , of the, is, 17 Km, height, troposphere, approximately

3. Read the next text and answer the questions. The Troposphere is the lowest portion of Earth´s atmosphere. It is approximately 80% of

the atmosphere´s mass and it contains most part of oxygen and water vapour of the atmosphere.

The average height of troposphere is approximately 17 Km , but in the tropic latitude is higher up to 20 Km.

Stratosphere is the second major layer of Earth´s atmosphere just above the troposphere and below the mesosphere. It is situated between 10 .20 Km and 50 Km. Stratosphere contains ozone layer which absorbs ultraviolet radiation, harmful solar radiation, from the Sun .

Scientist have discovered a hole in the ozone layer . This is produced by contaminant

products like CFCs. This kind of pollution is in aerosols or sprays so they must be reduced if we want to resolve this problem.

Answer: 1. What percentage of the atmosphere´s mass does the troposphere represent ?

a. 70% b. 80% c. 90% 2. What average height the troposphere is?

a. 10 Km b. 20 Km c. 17 Km 3. Select the correct answer:

a. The stratosphere is between the troposphere and the mesosphere b. The stratosphere is between the troposphere and the ionosphere c. The stratosphere is below the troposphere

4. The stratosphere reaches to : a. 150Km b. 100 Km c. 50 Km

5. The contaminant products that destroy the ozone layer is called: a. SDS b. CFC c. CFS

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UNIT 4 : THE ATMOSPHERE 1º ESO NATURAL SCIENCES

WEATHER AND CLIMATE

What’s the weather like today in the world?

Watch and play :

http://learnenglishkids.britishcouncil.org/es/fun-­games/whats-­the-­weather

Speaking practice: Do you know the difference between weather and climate?

Weather is considered to be the atmospheric conditions that are happening now or within a few days. On the other hand, Climate represents the long term atmospheric patterns within which weather occurs. As the popular saying goes, "Climate is what you expect, and weather is what you get!". VOCABULARY: WEATHER Activity :Use this link and match http://www.educa.jcyl.es/educacyl/cm/gallery/recursos_educativa/ingles_tiempo/pdf/OA3_weather_vocabulary.pdf Activity: Link with the definition http://www.weather.com/glossary/

Activity : Imagine that you are the weather man/ woman and you have to say the weather on the news. Write a short script about it.

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UNIT 4 : THE ATMOSPHERE 1º ESO NATURAL SCIENCES

Activity: Draw a comic weather joke. You have an example below.

RESOURCES FOR THIS LESSON https://www.ucar.edu/learn/1_1_1.htm http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Atmosphere.shtml https://buruagabilingual.wordpress.com/tag/programa-­aicle/

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