lesson: planet earth v ... · earth is the only planet in our solar system that has a surface...
Post on 18-Jan-2021
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Lesson: Planet Earth https://www.youtube.com/watch?v=HCDVN7DCzYE&t=60s
https://www.youtube.com/watch?v=JGXi_9A__Vc&t=15s
Learning Target
I can describe what makes Earth a habitable planet and unique in the solar system
Collaboration Time!
With your group, answer the following items in your notebook. Be ready to share out in class.
1. What makes Earth different than other planets in the solar system?
2. What features of Earth make it a habitable planet?
Watch the following video to find out how long it would take us to get to the closest Earth-like planet Click on the video
●
Habitable Zone● Habitable Zone: the distance from a star where it
is not too hot and not too cold for liquid water to exist
Astrobiology and Life in the Universe● The main things we look for when searching for
Earth-like planets are ● liquid water, an energy source, and nutrients● Probably not human-like life● Most likely microbes, bacteria or other simple life form
Extremophiles● Extremophiles: organisms that thrive in extreme
conditions○ Thermophiles: live in hot places○ Halophiles: live in salty places○ Acidophiles: live in a low pH○ Xerophiles: live in dry places○ Psychrophiles: live in cold places○ Methanogens: live in places with toxic gases○ Radio-resistant: can live in high levels of radiation
Watch the video to learn more about the ‘water bear’ an extremophile Click on the video
Water1.LIQUID WATER - Water can remain liquid between 5 and 230 °F
● All organisms that we know of need water to survive
Energy Source2.ENERGY SOURCE - All life requires a constant supply of energy
● The Sun provides all the energy for life on Earth
Atmosphere3. ATMOSPHERE - Earth’s atmosphere is the correct thickness and it has…
○ An Ozone layer○ A Magnetic field○ Greenhouse gases
Temperature4.TEMPERATURE - a medium temperature allows liquid water to exist
● Too hot: water turns to vapor● Too cold: water freezes
Nutrients5.NUTRIENTS - All life needs a constant supply of nutrients
● Matter cycles on Earth provide nutrients Carbon, Oxygen, Water, Nitrogen, Phosphorus
Watch the video to learn more about planet Earth
Click on the video
BIOSPHERE● Earth is the only place that has LIFE!● Earth is habitable because it has...1. Lots of liquid water2. A good temperature3. A perfect atmosphere4. Just enough energy from the Sun5. Lots of nutrients
HYDROSPHERE● Earth is the only planet in our solar system that has a
surface covered in liquid water● All other places in the solar system are either too hot
or too cold for liquid water to exist
GEOSPHEREEarth has active Plate Tectonics that create volcanoes and earthquakes that put greenhouses into the atmosphere
○ GHGs gases warm the planet
ATMOSPHERE● Earth’s atmosphere protects Earth from:..
○ Solar winds (magnetic field)○ UV radiation (ozone)○ Meteors (mesosphere) ○ Freezing Temperatures (GHGs)
ATMOSPHERE● Earth’s Magnetic Field: Is created by the liquid
metal in the outer core○ Protects Earth from Solar winds and gamma
radiation
Quick WriteLearning Target: I can describe what makes Earth a habitable planet and unique in the solar system
A habitable planet needs to have…
Earth is unique because…
Some features that make Earth unique in the solar system are...
Vocabulary
Habitable
Unique
Extremophile
Astrobiology
Habitable zone
Magnetic field
Ozone layer
Nutrients
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