By Jessica and Courtney

Seasons Vocabulary

Axis: the imaginary line that runs from the North Pole to the South Pole that earth rotates on

Rotation: the turning of an object on its axis

Revolution: the movement of an object around another


  • the layer we live in
  • extends up to 20 km
  • thickness depends on season
  • all weather happens here
  • thinnest, densest, and warmest layer


  • up to 50 km
  • contains almost no moisture or dust
  • has the ozone layer in it ( O3)
  • jet steam is between this layer and the troposphere


  • up to 80 km
  • coldest temp. is -90 degrees Celsius
  • meteors burn up in this layer


  • up to 300 km
  • least understood and most difficult to measure
  • air is extremely thin
  • can have flares up to 1500 degrees Celsius
  • contains the ionosphere


  • contains electricity charged ions which form intense radiation
  • creates the aurora borealis and the aurora australis ( northern and southern lights)


  • where the atmosphere transitions to space
  • up to 600 km
  • temps. sink to -270 degrees Celsius


  • the two periods during the year when the sun is at its furthest point from the equator
  • Latin word: "sol" meaning sun and "stitium" meaning stoppage
  • summer solstice is the longest day for our hemisphere
  • winter solstice is the shortest day for our hemisphere


  • two days during the year that day and night are equal
  • Latin word: means equal night


  • perihelion: the closest point to the sun in Earth's orbit
  • winter for Northern Hemisphere
  • aphelion: the farthest point from the sun in Earth's orbit
  • summer for Northern Hemisphere


Earth Orbit


What Causes Earth's Seasons.flv