SCI7 LESSON#3 4TH-Q

• Layers of the Atmosphere

  Troposphere

  Stratosphere

  Mesosphere

  Thermosphere

  Exosphere
• Troposphere is the layer closest to Earth’s surface (0-12 kms)

  - HOT – because of reflections of the ground (Mainit pa lamig kasi altitude)

  - where weather occurs

  - airplanes do not want to travel here because of turbulence

  -where weather balloons rise and pop
• Stratosphere is the layer of air that extends to about 50 km from Earth’s surface

  • where aircraft fly (or at least can fly with relative ease to the pilot) - (malamig painit) reason is that the direct heat source for the stratosphere is the Sun - where the ozone layer is
• Ozone layer - part of the Stratosphere

  - about 20-30 kms away from the sea level

  • contains ozone (also known as trioxygen with symbol: O3), a pale blue gas that which filters out wavelengths of UV light which can be dangerous to various organisms on the Earth’s surface
• Mesosphere - air is thin and cold (50- 80 km)

  • mainit palamig – kasi wala ng gas particles na mag aabsorb ng heat
  • where meteors burn
• Karman line - 100 km away from the crust - the official start of Outer space
• Thermosphere - air is thin (80-700 km)

  • temp changes is small but increasing, due to closeness to the sun - Aurora borealis and Aurora Australis (southern and Northern lights) occurs here
  • space shuttle and international space station
• Exosphere - last layer of the Earth’s atmosphere (700 km to 10000 km)

  • air is thin, gradual increase in temp
  • - where are found satellites