Venus (Week 2 Planets)

Question 1

What are the key points of Venus Planet Profile

Answer 1

• no moons
• 225 orbit period
• surface is 462 making it hard to land rovers
  -just smaller than earth

Question 2

what is venus atmosphere like

Answer 2

• strong and reflects sunlight
• VERY HIGH CO2 CONTENT
• clouds of sulfuric acid

Question 3

what is the magnetic field of venus like

Answer 3

• inner core not solidified so nothing protecting from ocean stripping/oxygen loss
• therefore venus has no dynamo

Question 4

why does venus not have a dynamo

Answer 4

• no cooling effect from cold lithosphere subduction
• rotating very slowly
• predynamo phase

Question 5

How was the mantle composition and size of venus determined and compared to earth

Answer 5

-Iron/Mg ratios
- primitive earth basalts and source mantle of mg
-Iron/Mn ratios
-venus and earth have comparable core sizes

Question 6

What makes Earth and venus geochemical ‘twins’

Answer 6

• size
  -density
• mantle composition (FeO, Mg)
• core size

Question 7

What is the geomorphology of venus

Answer 7

• restricted topography
• shorter and wider shield volcanoes

Question 8

Explain magmatism/ tectonics on venus

Answer 8

• venus is too hot for tectonics
• usually too hot for volcanism
• magmatic intrusions dont occur, no sills/dykes
  EVIDENCE
• 100 vs 1000 volcanoes per million years
• 3 times more degassing on earth
• more H20 released to earths surface