Lecture 10 Flashcards
What are techtonic plates?
The sections into which the lithosphere has fractured.
What is the core mostly composed of?
Iron and nickel
What is the iron catastrophe?
High temperatures caused nickel and iron to melt and sink to the core.
What chemical process lead to a silicate crust and mantle and a metallic core?
Chemical differentiation
What is a rocks curie point?
The temperature were a rock becomes susceptible to magneticism and pick up whatever magnetic field is around it at the time.
What are the 3 types of plate boundaries?
Convergent, divergent, transform
What is the athenosphere?
The ductile layer beneath the lithosphere
What was wagners evidence of pangea
Match of continental outlines, match of geological structures between continents, glaciation, fossil evidence,
What are the 3 types of convergent boundaries?
Ocean-continent
ocean-ocean
continent-continent
What is a ocean-continent boundary?
Plates converge and ocean crust is sub ducted beneath the continental plate
What is a ocean to ocean boundary?
Plates collide, one is subducted, islands can form
When does a transform boundary occur?
When two plates slide past each other.
