Grade 9: Atmosphere


Content (from CAPS document)

Exam Guidelines

Suggested activities and investigations (from CAPS document)



  • Mixture of gases held around the earth by gravity
  • Mixture known as air, consists of various gases (see Learning activity)
  • Density of atmosphere
  • Layers of atmosphere (see Learning Activity under Resources)

The greenhouse effect

  • Natural phenomenon that warms atmosphere sufficiently to sustain life
  • Greenhouse gases trap heat from sun, warming the surface of the sun
  • Most common greenhouse gases are carbon dioxide, methane and water vapour
  • Increase in greenhouse gases leads to global warming, an increase in the average temperature of the environment
  • Global warming causes climate change, rising sea levels, food shortages and mass extinctions

Investigating and reporting on the impact of global warming