the only body in the solar system known to have active volcanos other than the Earth is:
A titan.
B callisto.
C Io.
D triton.
the Galilean satellite with the smoothest surface is
A Io
B Europa
C Ganymede
D callisto
the Galilean satellite with the highest average density is
A Io
B Europa
C Ganymede
D callisto
Jupiter's rings were discovered by
A spacecraft photography
B momentary occultation of starlight as the planet moved in front of a star
C visual observations by Galileo
D direct ground-based photography
the largest satellite (moon) in our planetary system is
A phobos, one moon of Mars
B titan, a moon of Saturn
C Ganymede, a moon of Jupiter
D the Earth's moon
of the Galilean moons of Jupiter, callisto has a surface that is the most heavily cratered. this fact implies that, compared to the others, callisto has the
A highest bulk density.
B most ice on its surface.
C most evolved surface.
D least evolved surface.
E strongest magnetic field.
the most geologically active object in the planetary system at the present time is
A Mars
B Earth
C the Earth's moon
D Io, the innermost large satellite of Jupiter
the Galilean satellites have densities that are:
A about like that of solid rock.
B about like that of Earth.
C less than that of water.
D greater than that of any of the Jovian planets.
the Galilean satellite furthest from Jupiter is
A Io
B Europa
C Ganymede
D callisto
Io appears more active than the other Galilean satellites of Jupiter. this activity may arise from
A stronger heating of Io due to tidal friction.
B the radiation close to Jupiter.
C Io's smaller density.
D Jupiter's magnetic field.
the Galilean satellite with the largest diameter is
A Io
B Europa
C Ganymede
D callisto
Io, one of the major Jupiter moons, is undergoing extensive volcanic activity associated with interior heating which is caused by
A solar radiation and heat falling on the surface
B the effect of Jupiter's van allen particles
C original heat, caused by gravitational condensation at the moon's formation
D tidal distortion and internal friction because of flexing
the energy for the volcanic activity on Io results from
A radioactive substances with it.
B chemical reactions.
C tidal action.
D energy radiated from Jupiter and the sun.
E both (a) and (b) above.
Jupiter's moon Io has no observable impact craters because
A volcanic activity has covered them over.
B its proximity to Jupiter prevents large impacts.
C the surface is molten and meteorites sink into it.
D a thick atmosphere keeps us from seeing the surface.
which chemical or chemicals appear to play a prominent role in the "volcanoes" of Io?
A sulfur
B h2o
C methane and ammonia
D molten lava
the major chemical constituent of the layers of material continuously being deposited upon the surface of Io, the moon of Jupiter, by "volcanic" activity is
A water
B silicate dust and rock
C hydrogen
D sulfur
the main source of heat which produces Io's volcanic activity is
A the solar wind
B the Jupiter-Io tidal force
C Jupiter's rapid rotation rate
D radioactivity
which of these has an icy surface with few impact craters that is covered by intersecting lines that look like cracks?
A Io
B Europa
C Ganymede
D callisto
which of these is the darkest of Jupiter's big moons, and yet has a surface which is saturated by impact craters?
A Io
B Europa
C Ganymede
D callisto
the source of intense heating in the interior of Jupiter's moon Io, causing continuous and intense volcanic activity, is
A solar UV and visible radiation
B frictional heating as the solar wind impacts upon the moon surface
C tidal flexing and distortion, caused by Jupiter and the other large moons
D heat released by continuous shrinkage after creation, transforming potential gravitational
energy to heat
of the 4 Galilean satellites, the surface of ______ is currently the most active as evidenced by ______.
A callisto, cratering.
B Ganymede, fracturing.
C Europa, thawing and freezing of water.
D Io, volcanic activity.
which of these has the surface which has been least altered since its formation?
A Io
B Europa
C Ganymede
D callisto
the "volcanoes" on Jupiter's Galilean moon Io cover the surface of the moo with an annual layer of sulfur-laden material which is estimated to have what thickness?
A 1 meter
B about a millimeter
C 10 meters
D 10 centimeters
which of the Galilean satellites shows the oldest surface?
A Io
B Ganymede
C callisto
D Europa
which gas is thought to be responsible for the tremendous eruptions of material from Jupiter's innermost Galilean moon, Io, by providing the propulsive forces?
A sulfur in vapor form
B steam, or heated water vapor
C carbon dioxide, co2
D sulfur dioxide, so2
we can guess that Europa is active because we see
A lava flows.
B volcanic ridges and faults.
C no impact features.
D lobate scarps.
the radio bursts coming from Jupiter are now thought to be caused by a complex interaction between Jupiter's magnetic field and
A the red spot
B Io and its plasma torus
C the small inner satellites, including amalthea
D Jupiter's narrow ring
the satellite Io is interesting since it is the only body other than Earth known to exhibit
A a mainly nitrogen atmosphere
B oceans of liquid water
C current volcanic activity
D primitive life
compared to our moon, the Galilean moons of Jupiter tend to have
A a smaller mass.
B a lower density.
C smaller radii
D far fewer impact craters.
the material ejected by Io's volcanoes consists mostly of
A hydrogen
B helium
C sulfur
D iron
the Galilean satellite with many active volcanoes is
A Io
B Europa
C Ganymede
D callisto
the Galilean satellite showing the largest number of craters is
A Io
B Europa
C callisto
D Ganymede
which solar system body is believed to have deep oceans of liquid water under a surface of solid ice
A Io
B titan
C triton
D Europa
the Galilean moons farther from Jupiter have ________ density and a ________ proportion of water.
A lower, greater
B greater, greater
C lower, lower
D greater, lower
E there is no such pattern of density and proportion of water.
which of these has an icy surface with few impact craters and is covered b intersecting lines that look like cracks?
A Io
B Europa
C Ganymede
D callisto
the surfaces of some moons of Jupiter and Saturn are heavily cratered. we infer that these surface regions are
A regions of volcanic activity.
B relatively old.
C relatively young.
D highland regions.
E lowland regions.
the surface of Europa, one of the Galilean moons of Jupiter, appears to be covered with
A dark areas of older crust separated by lighter, grooved terrain
B many ancient craters and maria
C a smooth layer of ice, crossed by many cracks
D rugged mountain ranges and ancient volcanoes
we think four of the outer satellites of Jupiter were probably captured because:
A they are chemically different than the other satellites of the system.
B they orbit in the retrograde direction and that cannot be easily accounted for in other ways.
C they do not have atmospheres like the other satellites.
D they are exceedingly small and have prograde orbits.
the volcanism on Io is believed to be driven by
A sulfur dioxide and sulfur.
B carbon dioxide and dry ice.
C water vapor and carbon dioxide.
D none of these.
callisto and Ganymede, moons of Jupiter, have very shallow craters because
A they have dusty surfaces and solid cores
B no large bodies impacted them due to Jupiter's magnetic bow wave
C they have icy surfaces
D they are formed of metallic hydrogen and resist impact craters
the densities of the four Galilean satellites suggest that
A they are captured asteroids.
B they have been modified by collisions.
C the inner satellites were warmer than the outer satellites at formation.
D they formed long after Jupiter.
the required heating of the large Galilean moon, Io, of Jupiter, in order to produce volcanic activity is probably caused by
A original heat of formation
B nuclear fission within its interior
C radioactive elements in its surface
D distortion of its shape by gravitational forces from Jupiter and its other moons
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