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The Fifteenth Amendment,passed in 1870,mandated that
Sedimentary Layer
A layer of sedimentary rock which has been deposited over time, often distinguishable from other layers by its composition and color.
Granite
A coarse-grained igneous rock composed mainly of quartz and feldspar.
Stromatolites
Layered structures formed by the growth of microbial mats, often found in fossil form and considered some of the oldest evidence of life on Earth.
Microscopic Creatures
Tiny organisms that can only be seen with the aid of a microscope, including bacteria, protozoa, and some fungi and algae.
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