Atmosphere consists of gases that surround the Earth

The Earth’s Atmosphere is very important because it creates conditions suitable for life. Living

Air is matter, therefore it has mass. If air has mass it also has

Air pressure is measured in millibars. 1013 mb is the normal air pressure at

The higher is the altitude the lower is the pressure, and the opposite, the

Scientists divide the Earth’s atmosphere into 4 main layers: • Troposphere • Stratosphere •

The troposphere is the layer of the atmosphere where the weather occurs. It is

The stratosphere is the second layer of the atmosphere and contains the ozone layer.

The mesosphere is the third layer that protects the Earth from meteoroids. It is

The thermosphere is the last layer of the atmosphere. It starts from 80 km

Air can become polluted, especially if we talk about large cities. Air can be

From human activities: • Farming • Construction • Burning of fossil fuels (CO, NO₂,

The burning of fossil fuels can cause smog and acid rain. What do you

• Planting trees • Riding bicycles instead of driving cars • Factories must

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Atmosphere consists of gases that surround the Earth. What 2 gases make up most of the air? Oxygen and Nitrogen

The Earth’s Atmosphere is very important because it creates conditions suitable for life. Living things need oxygen to survive. Plants produce oxygen through photosynthesis. How would the amount of carbon dioxide in the atmosphere change if there were no plants? There would be more carbon dioxide.

Air is matter, therefore it has mass. If air has mass it also has other properties, including density and pressure. The weight of the atmosphere causes pressure. A barometer is used to measure pressure. There are 2 kinds: Mercury Barometer Aneroid Barometer

Air pressure is measured in millibars. 1013 mb is the normal air pressure at the sea level. What does “L” and “H” stand for on the map? L – low pressure H – high pressure

The higher is the altitude the lower is the pressure, and the opposite, the lower the altitude is the higher is the pressure. Where is air pressure higher, at the sea level or at the top of the mountains? At the sea level.

Scientists divide the Earth’s atmosphere into 4 main layers: • Troposphere • Stratosphere • Mesosphere • Thermosphere Where is the ozone layer? In the stratosphere. Where do commercial planes fly? In the stratosphere.

The troposphere is the layer of the atmosphere where the weather occurs. It is up to 9 -16 km thick. As we go higher the temperatures drop until -60⁰C at the top.

The stratosphere is the second layer of the atmosphere and contains the ozone layer. The ozone layer is important because it protects from dangerous ultraviolet radiation from the Sun. The stratosphere is up to 50 km high. Temperatures rise as we go higher. Why is upper stratosphere warmer than the lower stratosphere? Because the ozone layer radiates the heat from the Sun.

The mesosphere is the third layer that protects the Earth from meteoroids. It is 30 km thick (from 50 to 80 km). It is very cold with temperatures of -90⁰C.

The thermosphere is the last layer of the atmosphere. It starts from 80 km and blends gradually with outer space. The thermosphere is further divided into: • Ionosphere (Aurora Borealis happens in the ionosphere) • Exosphere

Air can become polluted, especially if we talk about large cities. Air can be polluted from natural sources: like forest fire and sandstorms.

From human activities: • Farming • Construction • Burning of fossil fuels (CO, NO₂, SO₂) What are some air pollutants produced by burning fossil fuels?

The burning of fossil fuels can cause smog and acid rain. What do you understand by the word “smog”? The mixture of smoke and fog. How does the acid rain form? Water droplets mix with SO₂ or NO₂ in the clouds.

• Planting trees • Riding bicycles instead of driving cars • Factories must reduce the emission of pollutants