Practice
What percent of the Cenozoic era is repre-
sented by the Neogene period, which lasted
from 23 mya to 2.6 mya? [Hint: Subtract to find
the length of the Neogene period.]

Neogene period is almost 31% of Cenozoic area.

Explanation:

Cenozoic era exists between 66 mya and zero mya. However, Neogene period existed between 23 mya to 2.6 mya. The difference is 20.4 mya.

To calculate the percent of neogene,

= (20.4/66) x 100

= 30.9%

Therefore, Neogene was approximately 31% of total Cenozoic era.

i'd say that the moon rock is about 2.2 billion years old.

i don't know. if i were you, i would search it up online : d