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#excavation
#soil layers
#bedrock
#geotechnics
#digging underground
#overburden removal
#shallow geology
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#soil profile
#soil horizons
#soil layers
#pedology
#topsoil
#subsoil
#bedrock
#soil structure
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#contour lines
#map lines
#topography
#landscape lines
#soil layers
#geography lines
#excavation #soil layers #bedrock #geotechnics #digging underground #overburden removal #shallow geology