Question

the rock strata (layers) we see are mostly made of *
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sedimentary rock
igneous rock
metamorphic rock

Explanation:

Rock strata, or layered rock formations, form primarily from the accumulation and lithification of sediment over time. This process is characteristic of sedimentary rocks, which often create distinct horizontal layers as new sediment deposits build up on top of older material. Igneous rocks form from molten material and do not typically form layered strata in this way, while metamorphic rocks are altered by heat and pressure, usually losing or obscuring original layering.

Answer:

A. Sedimentary Rock