28 of February

Today we learn more about the atmosphere, troposphere, stratosphere, mesosphere, thermosphere.

Troposphere
- Is where weather and climate occur.
- The troposphere is hited by the earth. The sun hits the surface of the earth and the erath reemits the energy  (green house effect).
- 11- 12 km
- Composition. nitrogen and oxigen. More than 50% of the mass is located here.

Stratosphere
- Temperatures start to increase again.
- Ozone is responsible for filtering the ultra violet radiation from the sun.

Mesosphere
- Lowest temperature in the atmosphere
- Falling stars

Thermosphere
- Few amount of water, density decrease a lot.

GREEN HOUSE EFFECT
- Green house gases absorb the energy and hit the atmosphere.
- It keeps the earth warm.
- We are increasing green house gases a lot, so the temperature is increasing (global warming)
- Green house effect is something good for us. Global warming is bad and humans are provoquing. We are increasing the green house effect in a no natural way , so we are creating global warming.