Formation of the Atmosphere The first atmosphere that Earth had was one made of two gases: hydrogen and helium. This atmosphere also was composed by ammonia and methane. Then when our Sun was formed, it released energy, which produce and outflow of charged particles. So that destroyed that first atmosphere.

Formation of the Atmosphere Then another atmosphere was formed by the gases that Earth eruptions were releasing. These gases were water vapor and carbon dioxide. Then the oxygen appeared on Earth´s atmosphere when bacteria called cyanobacteria produced the oxygen by the process of photosynthesis. The chemical reactions produce the ozone layer. Then Earth was able to support life.

Characteristics of the Atmosphere Composition: The Earth´s atmosphere is made of the mixture of various gases. These gases are: nitrogen, oxygen, carbon dioxide, water vapor, other gases(argon, neon, helium, methane, krypton and hydrogen) and particles of liquids and solids.

Characteristics of the Atmosphere Layers: Troposphere: -Inner layer of the atmosphere -Weather occurs -Its depth varies ( 16km above the Equator, 9km above the Poles) -Temperature: every kilometer (up) the atmosphere temperature gets cooler 6.5 ºC, but the constant temperature in a spot is of -60ºC.

Characteristics of the Atmosphere Stratosphere: -Temperature: the lower stratosphere is -60ºC then this layer begin turning warmer, this happen because the upper part of the stratosphere contains layers of ozone, which absorbs the UV rays from the Sun. -The airplanes and hot-air balloons fly here. Mesosphere: -Is the middle layer. -Temperature: -90ºC -Protect the Earth of meteoroids.

Characteristics of the Atmosphere Thermosphere: -Temperature: up to 1800 ºC -The air is very thin. Ionosphere: -The energy from the Sun transform gas molecules to become into ions -The aurora borealis form here Exosphere: -Is the outer layer of the atmosphere -The satellites are floating in this layer

Importance of the Atmosphere The atmosphere is very important because of the next reasons: 1. Protect us from UV rays 2. Make the changes in weather 3. Protect us from meteoroids 4. It provides us oxygen 5. It let an amount of Sun´s radiation enter to Earth to warmth it and make the water be in liquid form.

Relation Between human Activities and the Atmosphere SO2 or sulfur dioxide is one of the main atmospheric pollution components, and usually used as an indicator to monitor the environmental pollution. The spatio-temporal of SO2 in urban aera provides critical information on the air quality controlling. Being the developed district of China, Zhejiang Province and Mexico D.F.

lot of cars so that smoke contaminates too much the The OMI SO2 is the measurement of sulfur dioxide, and this have change a lot in this last years in too much places: from the 2005 to the 2008 in China, Zhejiang Province. The highest SO2 is appeard in the nothern part of this city in winter and the lowest in forest regions. .The SO2 is very dangerous for us and for the ones that produce. The Earths atmosphere has change a lot, because a lot of people are smoking and uses a lot of cars so that smoke contaminates too much the atmosphere. .The SO2 is very dangerous for us and for the ones that produce. The Earths atmosphere has change a lot, because a lot of people are smoking and uses a lot of cars so that smoke contaminates too much the atmosphere. Here you can see Chinese people have to use masks because there is very pollute.