The compound below is an ________. 
Definitions:
Sand, Gravel
Natural aggregate materials consisting of fine particles (sand) and coarse particles (gravel), used in construction and as soil components.
Cement
A binder, a substance used in construction that sets, hardens, and adheres to other materials, binding them together, typically made from limestone and clay.
Rocky Mountain Area
A major mountain range in western North America, extending from northern Canada to New Mexico.
Gulf Coast Area
A geographic region along the coastline of the Gulf of Mexico, known for its distinct ecological and cultural attributes.
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