1 - Global Tectonics Flashcards
Look at lecture slides for more info
1
Q
Describe the characteristics of continental crust.
A
Average density of 2830 kg/m3, average age of 2.2 Gyr, average thickness of 35km
2
Q
Describe the characteristics of oceanic crust.
A
Average density of 2890kg/m3, average age of 60 Myr, average thickness of 6.5km
3
Q
Describe the various characteristics of divergent plate boundaries.
A
Sea-floor spreading(creates new oceanic lithosphere as 75% of igneous rocks form in oceans), underwater volcannism mainly effusive, continental rifting(e.g. East African Rift Valley as thinning of lithosphere occurs)
