stuff na mahirap,,

• Aphelion - July

  When earth is farthest from the sun
• Perihelion - January

  When earth is closest to the sun
• 1. 66.50N - Arctic Circle
  2. 23.50N - Tropic of Cancer
  3. 00 - Equator
  4. 23.50S - Tropic of Capricorn 
  5. 66.50S - Antarctic Circle
• Tropical RainForest

  • Tropical moist climate
  • Annual rainfall: 100 inches
  • Average temperature: 18℃
  • Regions covered: 10º S and 25º N and S latitudes
• Savanna

  • Wet-dry tropical climate
  • Annual rainfall: 0.25 cm
  • Average temperature: 16℃
  • Regions covered: 15º to 25º N and S latitudes
• Desert

  • Dry tropical climate
  • Annual rainfall: 0.25 cm
  • Average temperature: 16℃
  • Regions covered: 15º and 25º N and S latitudes
• Photochemical smog        

  Gray-brown haze that hovers around cities        

  • forms as a result of the interaction of oxides of nitrogen , hydrocarbons, and solar energy in the

  form of ultraviolet light
• Thermal Inversion

  When warm air lies over cold air trapping toxic chemicals in the ground
• Acid deposition

  Form of precipitation that contains acid

  Wet deposition: Acid rain Dry deposition: particulates and gasses 
• Ozone depletion

  Destruction of the ozone molecules in the ozone layer mainly by chlorofluorocarbons
• Climate change

  Change of average conditions of temperature and rainfall

  • Main driver is greenhouse effect 
• Rotation refers to an object's spinning motion about its own axis

  • The rotation of the Earth is divided which gives rise to day and night
  • 24 hours for one complete rotation
  • Direction of rotation is counterclockwise
  • Sun rises in the East and sets in the West
  • Axis is tilted by 23.450/23.50 causing seasons
• Earth’s Revolution

  Movement of earth around the sun

  • one year or precisely in 365.242 (365 1/4) days is one revolution
  • The path of the earth’s revolution is called Orbit
• Solar eclipse

  Occurs when the moon is positioned between the earth and the sun 

  • The moon casts a shadow upon earth 

  SME: Sun Moon Earth
• Types of solar eclipse

  • Total solar eclipse Moon exactly covers the sun
  • Partial solar eclipse Only a portion of the sun is blocked by the moon
  • Annular solar eclipse The disk is seen surrounded by a bright thin ring
• Umbra

  Shadow gets smaller as it goes away from the sun
• Penumbra

  Shadow gets larger as it goes away from the sun
• Lunar eclipse - Orange moon

  Occurs when the moon moves within the shadow of the earth

  SEM: Sun Earth Moon
• • Total lunar eclipse Moon is entirely on the umbra of the earth’s shadow
  • Partial lunar eclipse Only a part of the moon passes through the umbra
  • Penumbral lunar eclipse Moon passed only through the penumbra of earth’s shadow
• RAIN

  Falls out when clouds become heavy with condensed water droplets
• SNOW

  Occurs when temperature in the cloud is below freezing point, changing water vapor into ice crystals
• FREEZING RAIN

  Forms when melted snow falls and turns into solid ice as it hits the ground 
• SLEET

  Forms when snow melts and refreezes as it falls through the layers of cold air