With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: The stratosphere is below the mesosphere.
text_B: The stratosphere -LRB- -LSB- ˈstrætəˌsfɪər ,   - toʊ - -RSB- -RRB- is the second major layer of Earth 's atmosphere , just above the troposphere , and below the mesosphere .. troposphere. troposphere. mesosphere. mesosphere. About 20 % of the atmosphere 's mass is contained in the stratosphere .. The stratosphere is stratified in temperature , with warmer layers higher and cooler layers closer to the Earth .. stratified. Atmospheric stratification. The increase of temperature with altitude is a result of the absorption of the Sun 's ultraviolet radiation by the ozone .. ozone. ozone. This is in contrast to the troposphere , near the Earth 's surface , where temperatures decreases with altitude .. troposphere. troposphere. The border between the troposphere and stratosphere , the tropopause , marks where this temperature inversion begins .. troposphere. troposphere. tropopause. tropopause. Near the equator , the stratosphere starts at 18 km ; at mid latitudes , it starts at 10 - and ends at 50 km ; at the poles , it starts at about 8 km .. poles. geographical pole. Temperatures vary within the stratosphere with the seasons , in particular with the polar night -LRB- winter -RRB- .. polar night. polar night. The greatest variation of temperature takes place over the poles in the lower stratosphere ; those variations are largely steady at lower latitudes and higher altitudes .. poles. geographical pole
related.