ch.8 Atmospheres of terrestrial planets
what is runaway greenhouse effect?
high temps cause evaporation of water that could have been on venus. H2O broken down by UV radiation from sun. H escapes to space and O remains and Form o3 ozone
what are astronomical factors
-Obliquity due to gravitational pull of larger mass planets or objects Sun - lack of magnetic spheres prevents
which type of light do greenhouse gasses in Earths atmosphere absorb the most
Absorbs UV
Why is Earths atmosphere not rusted even though it contains alot of O2
Because of the ozone layer. O3 absorbs UV lig unil it loses an Oxygen atom and become O2 again
most abundant greenhouse gas
CO2
what would happen without greenhouse effect
Earth would freeze
What is part of Earth's Natural Greenhouse effect
Earth's surface and atmospheric gasses absorb energy and then give off infrared light
If Earth's atmosphere were able to completely absorb visible light, what would be tru
Earth's surface temperature would be cooler than it is today
greenhosue effect
Infrared holding on to greenhouse gases, used to create atmospheres
what are geological factors
Valcanism- releases greenhouse gases into atmosphere
Which planet has a stronger atmospheric greenhouse effect (Venus or Mars)
Venus
which two planets have secondary atmospheres
Venus and Earth because they have large internal heat and gravity
Earth's surface is heate dby which two forms of energy
Visible and infrared
What three factors affect climate
astronomical, geological, Biological
Equilibrium Temperature
balance of two rates of energy -energy arrives in the form of sunlight and leaves in the form of infrared -rate energy leaves always balances rate it arrives
why doesnt Mars warm up
does not have an atmosphere which could hold enough co2 to warm it up
What are exospheres
gasses at/ above surface of planet
what are biological factors
human factors- fossil fuels burining releases co2 into atmosphere which intensifies greenhouse effect
Why cant Mars hold on to it's Secondary atmosphere
less heat and gravity and less dense than Venus and Earth
What is Magnetosphere
magnetic fields in earth that blocks Solar wind particles
what counts as far as amount of CO2 in atmosphere
not the % of it but the total amount(how much)
What effects Secondary atmosphere
surface gravity (hold on to atmospheres)
why do the moon and mercury lack atmospheres
their small with less internal heat Moons mass makes it have a low escape velocity Mercury too close to sun, gasses heat to high temp and escape planet
Why is Venus inhabitable
too close to sun, has Runaway greenhouse effect
