Soil and rock structure
Palabras clave
up high,
background,
below,
beneath,
brown,
composite,
cross,
digging,
dirt,
dry,
earth,
flat,
ground,
land,
layer,
loam,
mud,
nature,
opening,
profile,
section,
sequence,
dirtied,
stage,
structure,
texture,
topsoil,
tunnel,
underground
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