bedrock
clay
cross
crust
cut
design
development
diagram
dirt
earth
education
environment
flood
formation
gardening
geological
geology
grass
green
ground
horizon
humus
illustration
land
layer
material
matter
minerals
natural
nature
organic
parent
pattern
plain
plant
profile
rock
root
sand
science
section
soil
stone
structure
subsoil
surface
texture
topsoil
underground
vector
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