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29.2 The Inner Planets

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Katelynn Dorn

on 28 April 2015

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Transcript of 29.2 The Inner Planets

4th planet
orbit= 687 days, 1 rev.= 24 hr., 37 min.
seasons, 2 moons
volcanic- Olympus Mons
Valles Marineris- 4500 km canyon
Viking 1, Viking 2, Pathfinder all found evidence of erosion by water and flood plains
temp range= -130 to 20
29.2 The Inner Planets
2nd planet from sun
orbit= 225 days, 1 revolution= 243 days
rotates opposite direction
no moons
Earth's 'twin' but much warmer (464 degrees)
plains, volcanoes, lava, some mountains and valleys
basalt and granite on surface
96% CO2 in atmosphere
clouds- composed of sulfuric acid
Terrestrial Planets
Mercury, Venus, Earth, and Mars
solid rocks with metal cores
no rings
number of moons varies
impact craters
closest to sun, smallest orbit (88 days)
named after Mercurius
rotates completely on axis every 59 days
hard to see with telescope from sun behind it
once volcanic, covered with cliffs and craters
thin atmosphere- loses gas molecules to sun
daily temperature range= -173 to 427
molten iron core
no moons
3rd planet
orbit= 365.24 days, 1 revolution= 23 hours and 56 min.
5th largest, one moon
weathering and erosion change surface
water can exist as liquid
moderate temps (14 degrees)
plants and cyanobacteria provide oxygen
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