Question

A geologist discovered a fossil and a layer of rock. This fossil is an index fossil. What can he determine from this fossil?
A volcanic eruption.
The water in the rock
The age of the rock.
The type of rock.

Answer 1

The geologist can determine **the age of the rock** using the index fossil. Index fossils are used to identify and date the rocks in which they are found, as they are associated with a specific time period in Earth's history. They are typically widespread, abundant, and existed for a relatively short duration, which makes them useful for dating and correlating the age of rock layers.