#layer  a relatively thin sheetlike expanse or region lying over or under another
  supertype:  region.location__part  the extended spatial location of something; "the farming regions of France"; "religions in all parts of the world"; "regions of outer space"
  subtype:  stratum  one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism)
     subtype:  epidermis__cuticle  the outer layer of the skin covering the exterior body surface of vertebrates
        subtype:  mantle.epidermis__pallium  (zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell
     subtype:  stratum_corneum__stratumcorneum__corneum__horny_layer__hornylayer  the outermost layer of the epidermis consisting of dead cells that slough off
     subtype:  stratum_lucidum__stratumlucidum  the layer of epidermis immediately under the stratum corneum in the skin of the palms and soles
     subtype:  stratum_granulosum__stratumgranulosum  the layer of epidermis just under the stratum corneum or (on the palms and soles) just under the stratum lucidum; contains cells (with visible granules) that die and move to the surface
     subtype:  stratum_germinativum__stratumgerminativum__stratum_basale__stratumbasale__malpighian_layer__rete_Malpighii  the innermost layer of the epidermis
     subtype:  dermis__corium__derma  the deep vascular inner layer of the skin
     subtype:  cambium  the inner layer of the periosteum
     subtype:  paries__wall  (anatomy) a layer (a lining or membrane) that encloses a structure; "stomach walls"
        subtype:  abdominal_wall__abdominalwall  a wall of the abdomen
     subtype:  substratum__substrate  any stratum lying underneath another
     subtype:  horizon  a specific layer or stratum of soil or subsoil in a vertical cross section of land
        subtype:  soil_horizon  a layer in a soil profile
           subtype:  A-horizon__A_horizon  the top layer of a soil profile; usually contains humus
           subtype:  B-horizon__B_horizon  immediately below the A-horizon; contains deposits of organic matter leached from surface soils
           subtype:  C-horizon__C_horizon  beneath the B-horizon and above the bedrock; consisting of weathered rock
        subtype:  geological_horizon  a layer of rock with a particular composition (especially of fossils); for dating the stratum
     subtype:  seam.stratum__bed  a stratum of ore or coal thick enough to be mined with profit; "he worked in the coal beds"
        subtype:  coal_seam  a seam of coal
     subtype:  bed.stratum  (geology) a stratum of rock (especially sedimentary rock); "they found a bed of standstone"
        subtype:  ore_bed__orebed  a stratum of ore
  subtype:  asthenosphere  the lower layer of the crust
  subtype:  chromosphere  a gaseous layer of the sun's atmosphere (extending from the photosphere to the corona) that is visible during a total eclipse of the sun
  subtype:  Earth's_crust__crust  the outer layer of the Earth
     subtype:  horst  a ridge of the earth's crust that has been forced upward between two faults and so is higher than the surrounding land
  subtype:  exosphere  the outermost atmospheric layer
  subtype:  hydrosphere  the watery layer of the earth's surface; includes water vapor
  subtype:  lithosphere__geosphere  the solid part of the earth
     subtype:  plate.lithosphere  a rigid layer of the lithosphere that is believed to drift slowly
  subtype:  lower_mantle__lowermantle  the deeper part of the mantle
  subtype:  mantle.layer  the layer of the earth between the crust and the core
  subtype:  mesosphere  the atmospheric layer between the stratosphere and the thermosphere
  subtype:  ozone_layer__ozonelayer__ozonosphere  a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
  subtype:  stratosphere  the atmospheric layer between the troposphere and the mesosphere
  subtype:  Earth's_surface__surface  the outermost level of the land or sea; "earthquakes originate far below the surface"; "three quarters of the Earth's surface is covered by water"
     subtype:  floor.Earth's_surface  the bottom surface of any a cave or lake etc.
  subtype:  thermosphere  the atmospheric layer between the mesosphere and the exosphere
  subtype:  tropopause  the region of discontinuity between the troposphere and the stratosphere
  subtype:  troposphere  the lowest atmospheric layer; from 4 to 11 miles high (depending on latitude)
  subtype:  upper_mantle__uppermantle  the upper part of the mantle
  subtype:  snow  a layer of snowflakes (white crystals of frozen water) covering the ground
     subtype:  corn_snow  granular snow formed by alternate thawing and freezing

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