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

Temperature
2. Liquid water
3. Atmosphere
4. Energy
5. Nutrients
1.
0 to 120 ºF (20 to 50 ºC)
 High temperatures breakdown
DNA
 Low temperatures slow down
metabolism


Hottest inhabited place on
Earth at 159 °F (71 °C)
The coldest inhabited
place on Earth
 -46 °C (-51 °F) average

-42 °F
All living organisms
require LIQUID
water
 Between 35 and
100 ºF (2 to 38 ºC)

Protection from Meteorite
impacts
 Greenhouse gases



Keep heat in
Ozone Layer

Protection from UV radiation
Too many = too hot
 Too few = too cold


Light or chemical energy is
needed for life processes
› Photosynthesis is the main
way energy enters
ecosystems
A constant supply is
needed for life
 Processes that
provide nutrients

› Matter Cycles
› Volcanoes
› Earthquakes