1 At 1 4 ppt Layers of the

1 At 1. 4 ppt Layers of the Atmosphere W&C Chapter 1. 4 Pages 31 -36

How are the layers classified? The four main layers of the Atmosphere are classified according to changes in: Additional Info

A. Troposphere Tropo = changing conditions 1. We live in this layer 2. Where weather occurs 3. Thinnest Layer (10 km), contains most of the mass of the atmosphere 4. Clouds form in this layer.

B. Stratosphere Strato = layered, spread out • Has the Ozone Layer (O 3) • Absorbs UV radiation, heating up this layer and making it warmer higher up.

The Stratoposhere… A • Is where weather occurs B • Absorbs UV radiation C • Is where we live D • Burns up meteors

C. Mesosphere Meso = Middle • Coldest layer at -90˚C • Burns up Meteoroids you see as a shooting star.

D. Thermosphere Thermo = Heat • • • Molecules are spread very far apart No Outer Limit N 2 & O 2 molecules absorb heat, raising their temperature to 1, 800°C – You would still feel cold here Why? (Divided into 2 layers)

D 1. Ionosphere Ions = charged particles • Causes the Aurora Borealis (Northern Lights) • Bounce radio communications off this layer.

D 2. Exosphere Exo = “outer” • Outermost layer of thermosphere • Satellites orbit here.

A The layer where weather occurs is the… • Troposphere B • Mesosphere C • Thermosphere D • Exosphere

A The layer where satellites orbit is the… • Ionosphere B • Mesosphere C • Thermosphere D • Exosphere

Exit Pass • List 3 of the layers of Earth’s atmosphere. • Describe why 2 of them are important.

What to Work On • Read Section 1. 4 (pages 31 -36) • Answer the Section Review questions (#’s 1 -4) on page 36 DUE: Wednesday, May 16 th