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