Question

question 3
what is extraordinary about the vishnu schist?
○ they are some of the oldest rocks in america.
○ they are some of the shiniest rocks in america.
○ they are some of the darkest rocks in america.
○ they are some of the youngest rocks in america.

Explanation:

The Vishnu Schist is known for being among the oldest exposed rock formations in North America (specifically in the Grand Canyon region), with an age of around 1.7 billion years. The other options about shininess, darkness, or being youngest do not align with its geological significance.

Answer:

A. they are some of the oldest rocks in America.