The Precambrian basement rocks of the Upper Peninsula of Michigan ...

[fbq8i]

The Precambrian basement rocks of the Upper Peninsula of Michigan became part of the North American continent
 
  A) more than 2.5 billion years ago.
  B) 1.9 billion years ago.
  C) 1.8 to 1.9 billion years ago.
  D) 1.7 to 1.8 billion years ago.
  E) about 1.1 billion years ago.

Question 2

Rocks greater than 2.5 billion years old were formed by
 
  A) volcanic arcs at mid-ocean ridges.
  B) volcanic arcs at convergent boundaries.
  C) uplift of crust.
  D) collision of tectonic plates.

[jesse.fleming]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: B