Question

Geologists have discovered that rocks in the Appalachian Mountains of North America are the same as the rocks in the Caledonian Mountains of Europe.

Which TWO things do the rocks provide evidence of in terms of the geologic understanding of Earth?


Plate motions have occurred in the past.


Ocean currents have moved rocks over time.


Rocks from the same geologic time period are the same.


Sections from different continents were once connected.


Certain types of rocks can only be found in certain environments.

Answer 1

- Plate motions have occurred in the past.
- Sections from different continents were once connected.

Explanation: Identical rock types and sequences in the Appalachians and Caledonides are best explained by those landmasses having been joined in the past and later separated by plate motion (continental drift).