Which statement is true about youngest rocks in an undisturbed sequence?

Which statement is true about youngest rocks in an undisturbed sequence?

• A. Top
• B. Bottom
• C. Middle
• D. Oldest on the bottom

Answer: (A)

Youngest rocks are on the top in an undisturbed sequence because new layers form on top of older ones. This is the idea behind the order of deposition: the bottom layer is the oldest, the top layer is the youngest, and layers in between are progressively older than the top but younger than the bottom. If the sequence has not been disturbed by tilting or folding, you can read the record from bottom (oldest) to top (youngest). The statement that the youngest rocks are at the top is the one that matches how sedimentary layers accumulate over time.

Youngest rocks are on the top in an undisturbed sequence because new layers form on top of older ones. This is the idea behind the order of deposition: the bottom layer is the oldest, the top layer is the youngest, and layers in between are progressively older than the top but younger than the bottom. If the sequence has not been disturbed by tilting or folding, you can read the record from bottom (oldest) to top (youngest). The statement that the youngest rocks are at the top is the one that matches how sedimentary layers accumulate over time.