changing atmosphere

• what were the main gases in the atmosphere?

  carbon dioxide

  water vapour

  (ammonia,methane,sulfur dioxide)
• where did these gases come from?

  volcanic activity
• what planet has a similar atmosphere to the Earth?

  Venus
• what is the percentage of nitrogen in the atmosphere?

  78%
• what is the percentage of oxygen in the atmosphere?

  20%
• what is the percentage of argon in the atmosphere?

  1%
• what is the percentage of carbon dioxide in the atmosphere?

  0.04%
• what other gas is found in the atmosphere?

  water vapour
• what is carbon footprint?

  The total amount of greenhouse gases emitted directly or indirectly by an individual, organization, or product.
• describe an expirement to show that oxygen makes up around 20% of the atmosphere?


  -pass a fixed volume of air over copper metal

  -copper will react with oxygen to form copper oxide

  -volume of air will decrease by 20%
• what human activities contribute to global warming?

  burning fossil fuels

  deforestation

  burning waste
• how can the impact be reduced?

  use renewable energy sources

  recycle waste materials
• how does global warming work?

  1)short wave radiation from Sun passes through the Earth's atmosphere.

  2)Longer wave radiation is emitted by the Earth.

  3)Radiation is absorbed by CO2 molecules and other greenhouse gases in the atmosphere.

  4)As more CO2 is released,the average temperature of the atmosphere increases
• State and explain the 3 process that reduced the carbon dioxide levels over 4.5 billion years?

  1)water vapour cooled and condensed to form oceans,and carbon dioxide dissolved in the newly formed oceans.

  2)Early plant life took in carbon dioxide during photosynthesis

  3)The carbon dioxide that dissolved in the oceans formed carbonates,and used to form the shells of early sea animals
• which of these process also increased the oxygen levels in the atmosphere?

  photosynthesis
• how does carbon dioxide form and the pollutant?

  global warming

  burning fossil fuels
• how does sulfur dioxide form and the pollutant?

  acid rain

  burning fossil fuels(which contain S)
• how does nitrogen oxides form and the pollutant?

  acid rain

  N2 and O2 reacting in hot engines
• how does carbon particles form and the pollutant?

  respiratory problems

  incomplete combustion fossil fuels
• how does carbon monoxide form and the pollutant?

  toxic

  incomplete combustion of fuels