Scarps basically cliffs on Mercury bc it’s large core shrunk and made a wrinkle effect. Which hemisphere of Mars has older surface? Southern hemisphere. Moon/Mercury don’t have atmosphere bc too small and gravity too weak to retain significant atmosphere. We have O 2 bc of photosynthesis and it only started 2 bil years ago. If there was no greenhouse effect, Earth’s average temp would be colder than freezing. We have liquid water bc right temp and pressure. Venus constant greenhouse effect: hot and inhospitable Planet is plotted according to atms temp and pressure with Earth at E. Where is Mars? C Cold & low pressure Mars must’ve been too small to keep geological activity happening for surface liquid water. 2 class of Jovians: Jupiter/Saturn (Gas Giants) & Uranus/Neptune (Ice Giants) Why is Earth habitable? Right distance from Sun and large enough to be geologically active. Rock, “ices”, metals for their cores of Gas Giants Cloud bands on Jovian planets run east west and bound by wind flows, jets, bc rapid rotational speeds. Jovian storms are called ovals (can’t move N/S) Would Neptune burn from a match from all the flammable gases? No, no Oxygen! Io (Jupiter moon) is most volcanically active bc gravity is deforming it (tidal bulges) Which of Ganymede’s terrains is older? Darker terrain is more heavily cratered. Neptune most likely captured Triton so it orbits Neptune backwards Saturn’s rings are 99.9% pure water ice continually forming and dispersing clumps of particles, confined within a thin plane. Other rings are made from dust/dirt so not as visible Jovians have rings because they have a lot of dust impact which replenishes supply of dust for rings. A small asteroid that orbits within the asteroid belt has an active volcano, surprising? Implausible, Asteroids too small to be geologically active now. Comets have 3 parts: Nucleus dark dirty snowball of ice and dirty dust, Coma cloud of gas and dust surrounding nucleus, Tail dust and ion tail always points away from the sun Comet nucleus is darker than a lump of coal Two populations of comets: Kuiper Belt and the Oort Cloud Known gas in tail was cyanogen. Gas in tail is very diffuse so it doesn’t matter if we pass through it According to our theory of solar system formation, what are asteroids and comets? Leftover planetesimals that never accreted into planets What evidence supports Mercury once shrank by 20km in radius? Presence of many long, tall cliffs In what ways is Earth different from other terrestrial planets? O 2 in atmosphere, life everywhere, most of surface covered in liquid water, crust broken into plates that move around. What do we mean by frost line? Circle at a particular distance from the Sun, beyond which the temp was low enough for ices to condense Planet with highest average surface temp is Venus Olympus Mons is huge shield volcano on Mars Describe surface of Mars All of the big volcanoes are in the northern hemisphere and most of the craters are in southern hemisphere.
You've reached the end of your free preview.
Want to read both pages?