Discussion
Arrange correctly the following continental assembly according to ages :
| (a) Ur | 1. ∼3.0 Ga |
| (b) Nena | 2. ∼1.5 Ga |
| (c) Rodina | 3. ∼1.8 Ga |
Answer: D
The keyed matching is (a) - 1, (b) - 3, (c) - 2: Ur about 3.0 Ga, Nena about 1.8 Ga and Rodinia (printed Rodina) given about 1.5 Ga.
In the scheme of Rogers, Ur is the earliest proposed continent, assembled around 3.0 Ga. Nena (North America, Europe and Asia, the core of Columbia) was assembled around 1.8 Ga. Rodinia is the youngest of the three; it is usually dated to about 1.1 to 1.0 Ga, so the 1.5 Ga in the list is not its standard age, but it is the youngest age offered and the only one left for it once Ur and Nena are placed.
The other options put Nena or Rodinia earlier than Ur, or give Nena the youngest age, which reverses the order of assembly.
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