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19 Subcategories

• stratum go
  one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
  
• asthenosphere go
  the lower layer of the crust
  
• chromosphere go
  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
  
• crust, Earth's crust go
  the outer layer of the Earth
  
• exosphere go
  the outermost atmospheric layer
  
• hydrosphere go
  the watery layer of the earth's surface
  
• lithosphere, geosphere go
  the solid part of the earth consisting of the crust and outer mantle
  
• lower mantle go
  the deeper part of the mantle
  
• mantle go
  the layer of the earth between the crust and the core
  
• mesosphere go
  the atmospheric layer between the stratosphere and the thermosphere
  
• ozone layer, ozonosphere go
  a layer in the stratosphere (at approximately 20 miles) that contains a concentration of ozone sufficient to block most ultraviolet radiation from the sun
  
• stratosphere go
  the atmospheric layer between the troposphere and the mesosphere
  
• surface, Earth's surface go
  the outermost level of the land or sea
  
• thermosphere go
  the atmospheric layer between the mesosphere and the exosphere
  
• tropopause go
  the region of discontinuity between the troposphere and the stratosphere
  
• troposphere go
  the lowest atmospheric layer
  
• upper mantle go
  the upper part of the mantle
  
• cell wall go
  a rigid layer of polysaccharides enclosing the membrane of plant and prokaryotic cells
  
• snow go
  a layer of snowflakes (white crystals of frozen water) covering the ground