Constructive Processes: Evidence for Maps I Flashcards
1
Q
What can patterns on maps tell us?
A
continents looking like puzzle pieces (Pangaea) and mountain ranges occur on margin of continents
2
Q
How do you date mid-ocean ridges?
A
By molten lava (magma)
3
Q
Where are old mid-ocean ridges located?
A
Margin of continents
4
Q
What can cause small earthquakes?
A
Lava being squeezed up out of black smokers
5
Q
What are black smokers?
A
Geothermal Hot Springs
6
Q
List the characteristics of mid-ocean ridges?
A
Hot, young, active, show fresh lava, form where continents were formerly joined
7
Q
Why are the mid-ocean ridges no more than 160 Ma years old?
A
The older mid-ocean ridges move towards the continents.
8
Q
What event started the formation of the ridges?
A
Pangea
9
Q
Why are mid-ocean ridges active?
A
Because lava comes out causing earthquakes and volcanism
