Question

read the passage and answer the following question(s).
dating rock strata
scientists can determine the age of rock layers by measuring radioactive elements found in the rock.
radioactive elements found in sedimentary rocks decay quickly, so this method can only date
sedimentary rocks that are less than 50,000 years old.
volcanic rock contains radioactive elements that decay
very slowly, so scientists can date volcanic rocks that
are much older than 50,000 years.
a team of scientists is investigating a rock formation
found in a region. the diagram shows the rock
formation that the scientists are investigating.
how old are the fossils in layer 5?
a. between 400 and 550 million years old
b. between 240 and 400 million years old
c. younger than 240 million years old
d. older than 550 million years old

Explanation:

The diagram shows the age of rock layers. Layer 5 is between the layer that is 240 million years old (layer 8) and the layer that is 400 million years old (layer 4). So, the age of fossils in layer 5 should be between 240 and 400 million years old.

Answer:

B. between 240 and 400 million years old