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Transcript
Chapter 6
VENUS
Radius
6057 km
Mass
4.689 X1024 kg
Density
5250 kg/m3
Atmosphere
Composition
Physical Features
Distinct Characteristics
Discovery (Who and
When)
Distance from the Sun
96% CO2
3% N
0.1% Water vapor
Pressure 90 atm
Sulfuric Acid clouds
Basaltic rock and Altered
materials
Low rolling hills
Two raised craters called
Terras
Ishtar Terra Taller than Mt.
Everest
Clockwise spin and retrograde
motion
Sulfuric Acid clouds
Strong lightning storms and
acid rain
1-220 mph winds
Prehistoric times
0.72 AU
Temperatures
80 – 872 degrees Fahrenheit
Orbital Period
224.7 days
Rotation Time
243.0 days (longer than a
year)
None
Moons (how many and
names)
Physical Characteristics
Rolling planes 70% of surface 35% on Earth (continents)
Lowlands 20% of surface
65 % on Earth (oceans)
Highlands 10%
Plains found to be made of K rich basalts and granite
Meteorite craters erased by volcanic activity
Intense volcanic activity as large as 1000 km diameter
- Ishtar Terra 12 km high (Mt. Everest 10 km high)
-Shield volcanoes formed by highly liquid lava
(like Mt. St. Helens)
No direct evidence of plate tectonics, but the term blob
tectonics has been used to explain observations
Stages of development
1. Differentiation -Heavier elements move towards the middle
2. Cratering - Caused lava to flow by breaking surface
3. Lava flows
Evolution of Atmosphere
Heat evaporated water
Could not convert CO2
Run away green house effect
Very dense atmosphere
- 10 times less dense than water (Earth 1000X less dense)
- We could fly with wings strapped on our arms
350 kph winds at the top of the atmosphere
1-2 kph at the surface
Topography Map
Venera 13 3/1/82
Venera 13 3/1/82
Venera 13 3/1/82
Venera 14 3/5/82
Adams crater
Alcott Crater
Cleopatra Crater
Anemone Volcano
Volcano Cone Cluster
Pancake Volcanoes
Tick Volcano
Arachnid
Alpha-Regio Upland
Eistla Regio - Rift Valley
Sinuous Channel
Parallel Lines