WHAT I SEE… Four Interactive Systems

HYDROSPHERE : All the water on Earth

GEOSPHERE: Surface of the EarthBIOSPHERE: All organisms on

EarthATMOSPHERE: …..

What is Atmosphere?

A blanket of gases surrounding the Earth.

The Atmosphere is divided into 5 different layers

1. Troposphere: 0-10km2. Stratosphere: 10-50km3. Mesosphere: 50-100km4. Thermosphere: 100-

500km5. Exosphere: 500-700km

Make a PredictionIs the atmosphere thick or

thin compared to the radius of the earth?

The atmosphere is very thin!!Analogy If the earth was an

apple the atmosphere would be the skin...

What is the composition of the Atmosphere?

Gases & Particles

Atmospheric Gases & Particles

N2,O2= 97-99% H2O Vapor= 0.0-4.0%Ar= 1% CO2= 0.03%Trace Gases= 0.01%

Particulate Matter: mixture of solids & aerosols dust, water droplets, smoke, ash, wind erosion

What keeps the atmosphere around the Earth?

GRAVITY!!!

FACT: 80-90% of the atmosphere is found in the Troposphere..

Sources of Atmospheric Gases and Particulate Matter

Natural vs.

VolcanoesForest FiresPlants Decaying PlantsLandscape SoilOceans

Anthropogenic

Fossil FuelsTransportationPower plantsIndustrial

What do you think…Has the concentration of gases

changed over time??

Yes, concentration of gases have changed over time and vary form

place to place.

In Class Activity

Write a short response.. How was the atmosphere

formed???

Scientific Literacy • Where would you look to find the

answer??• Reliable Scientific Source• http://astrobiology.nasa.gov/ask-

an-astrobiologist/intro/

The air around you importance of atmosphere

• Makes Earth suitable for life • Moderates Temperature• Water• Keeps out harmful rays from sun & space

HOMEWORK

• Review notes and text pages 280-288

• Quiz Tomorrow

Homework

•Read text p. 286-296•Write a short response..

How was the atmosphere formed???