Question

The table shows different geologic time periods:

Period
Number of Years Ago
Jurassic
2.08 ⋅ 108
Silurian
4.38 ⋅ 108
Tertiary
6.64 ⋅ 107
Triassic
2.45 ⋅ 108

Order the time periods from oldest to youngest.

Answer 1

2.08 x 10^8 = 208,000,000
4.38 x 10^8 = 438,000,000
6.64 x 10^7 = 66,400,000
2.45 x 10^8 = 245,000,000

oldest to youngest : Silurian, Triassic, Jurassic, Tertiary

Answer 2

The time periods from oldest to youngest:
Silurian
Triassic
Jurassic
Tertiary