Question

1. what are rock layers also called?

○ fossils
○ strata
○ crystals
○ plates

1. which rock layers are usually the oldest?

○ the ones on the top
○ the middle layers
○ the ones at the bottom
○ layers with the most fossils

Explanation:

1. Rock layers are a key geological feature with a standard alternative term. Strata is the scientific name for these layered rock formations, while the other options refer to different geological/biological features.
2. Based on the principle of superposition in geology, sedimentary rock layers form with new layers depositing on top of older ones, so the bottom layers are the oldest.

Answer:

1. B. Strata
2. C. The ones at the bottom