Question

rock strata are often folded, as shown in this image. if the pink layer has an absolute age of 350 million years, which two of these statements must be true? the khaki layer was formed after the pink layer the light green layer is more than 350 million years old the brown layer is also 350 million years old the pink layer folded more than 350 million years ago

Explanation:

1. Using the principle of superposition (undisturbed sedimentary layers: lower layers are older), the khaki layer is beneath the pink layer, so it formed before the pink layer, making the first statement false.
2. The light green layer is above the pink layer, so it must be younger than 350 million years old, making the second statement false.
3. The brown layer is part of the folded sequence with the pink layer, meaning it was deposited and folded at the same time as the pink layer, so it is also 350 million years old, making this statement true.
4. The folding event affected all layers including the pink layer, so the folding must have happened after the pink layer formed (350 million years ago), meaning it occurred more than 350 million years ago, making this statement true.

Answer:

• The brown layer is also 350 million years old
• The pink layer folded more than 350 million years ago