Answer: Sedimentary rock
Explanation:
From google (There are three main types of rock: igneous rock, metamorphic rock, and sedimentary rock. Almost all fossils are preserved in sedimentary rock. Organisms that live in topographically low places (such as lakes or ocean basins) have the best chance of being preserved.)
Answer:
Mohorovicic discontinuity, or simply the Moho.
The great plains, if we're talking about america here.
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They can form deep in side the earth's crust by crystallization of melted materials