What makes a world habitable?

What makes a world habitable?

What makes a world habitable?What makes a place habitable?Think of life forms and what they need to survive here on Earth.REMEMBER life comes in all shapes and sizes from a tiny microbe, to a human being In your group, come up with 5 things that a world needs to have in order for life to exist there What makes a world habitable?TemperatureLiquid waterAtmosphereEnergyNutrients

1. Temperature0 to 120 F (20 to 50 C)High temperatures breakdown DNA Low temperatures slow down metabolism

Lut Desert, IranHottest inhabited place on Earth at 159 F (71 C)

Oymyakon, RussiaThe coldest inhabited place on Earth-46 C (-51 F) average

-42 F2. Liquid WaterAll living organisms require LIQUID water Between 35 and 100 F (2 to 38 C)

3. AtmosphereProtection from Meteorite impactsGreenhouse gasesKeep heat inOzone LayerProtection from UV radiation

Greenhouse GasesToo many = too hotToo few = too cold

4. EnergyLight or chemical energy is needed for life processesPhotosynthesis is the main way energy enters ecosystems

5. NutrientsA constant supply is needed for lifeProcesses that provide nutrientsMatter CyclesVolcanoes Earthquakes