earth & space: directed reading
recent in years and all happened at the same time
How could the craters on Venus be described?
687 days
How long is Mars's orbital period?
24.5 hours
How often does Mars rotate on its axis?
70% of the earth is ocean that absorbs the CO2 and atmosphere allows heat to escape
How was Earth able to maintain the moderate temperatures that were necessary to support life?
erosion
Mars has many surface features that are characteristic of ____________ by water.
canyons
Mars is believed to have been geologically active because of its massive volcanoes and a system of deep __________ on its surface.
4th
Mars is the _________ planet from the sun
olympus mons
The largest volcano on Mars is _____________, which is three times the height of Mount Everest and has a base about the size of Nebraska.
basalt & granite
The surface of Venus is composed of which two types of rock?
volcanoes erupting creating new land
What evidence indicates that Venus undergoes a periodic resurfacing?
water, temp, & oxygen
What three elements does Earth have in the proper combination necessary to support life?
the poles
Where might water exist as permanent frost or as a liquid on Mars?
they both tilt on the same degree on their perspective axis'
Why are Mars's seasons similar to Earth's?
too far from the sun
Why can water not exist as a liquid on Mars?
the surface does not change or move
Why do scientists think that Martian volcanoes have grown so large?
the distance from the sun
Why is Earth the only outer planet on which water exists in a liquid state?
rain droplets reflect the suns light making it the brightest object in the sky. it is only seen in the mornings or evenings
Why is Venus commonly referred to as the evening star or morning star?
magellan
a U.S. satellite that collected data about Venus
volcano
a landform commonly found on Venus
craters
bowl shapes depressions that formed on the surface of inner planets when the planets collided with other objects in space
rocky & metallic cores
composition of the inner planets
rotation
earth completes one __________ on it's axis every day
3rd
earth is the ________ planet from the sun
255 days
how long is the orbital period of venus, the second planet from the sun?
one
how many moons does earth have
243 days
how often does venus rotate?
mercury, venus, earth, mars
inner planets
59
mercury rotates on its axis once every _____ days
a large number of craters
mercury's surface features a long line of cliffs and
88
mercury, the closest planet to the sun, circles the sun every _____ days
250 million
over the last _________ years, earth's continents separated from a single landmass and drifted to their present positions
a large daily temp range
the absence of a dense atmosphere and mercury's slow rotation contribute to
inner planets
the four planets closest to the sun
Maat Mons
the highest volcano on Venus
terrestrials
the inner planets are also called the __________ because they are like earth
365.25
the orbital period of earth is _______ days
earth
the planet that venus most resembles in mass, size, and density is ___________
acid rain
venus appears to be very bright in the night sky because drops of _________ form a cloud layer that reflects sunlight
90
venus' atmosphere pressure is about _______ times the pressure on earth
96%
what percentage of the atmosphere on venus is composed of carbon dioxide?
greenhouse effect
what phenomenon occurs when solar energy heats venus' surface and the high concentration of carbon dioxide in the atmosphere blocks most of the infrared radiation from escaping?
thick atmosphere (CO2) and slow rotation
what two factors cause high temps on vemus
tectonic plates & weathering erosion
what two factors have caused the surface of earth to keep changing?
