Weather occurs in the lowest part of the atmosphere which we call the "troposphere". In this area the air contains water vapour and clouds which produce our weather, and the temperature falls with height.

At about 6km (20,000 ft) over the poles and 17 km (56,000 ft) over the Equator, the tropopause is the boundary between the troposphere and the stratosphere, which extends to the stratopause at about 50 km (31 miles). Stratosphere air is very dry. Air temperature gradually decrease with height but stops falling in the lower stratosphere. Below 25 km (15 miles) dry air consists of 78.08 % nitrogen and 20.94 % oxygen, with traces of other gases.Next week.....How plants adapt to climatesAnswer to last weeks question: over 600 km.This week's question: Weather occurs in the:

A/ Stratosphere.

B/ Troposphere.Best of Luck.Glossary:

Barometer: An instrument for measuring atmospheric pressure. The most accurate type is the mercury barometer, which measures the distance pressure forces a column of mercury up a tube containing no air.The most common barometer is the aneroid barometer, which measures changes in the volume of corrugated metal box.Weather for coming week Monday 25th February-Friday 29th FebruaryThe weather milder than average by day but some clearer colder nights with slight frost in places.Good deal of dry weather apart from some rain on Monday evening and night, risk of short lived light rain later in week otherwise dry.Winds from west south-west gusting between 30 and 55 mph at times.Maximum temperature 10-13c 50-55f.Minimum temperature 1-7c 34-45f.Last Week's Observations (Monday-Friday)Highest day temperature...........14.8c 59f on Friday 22nd February.Lowest night temperature...........minus 5.9c 21f on Monday 18th February.Wettest day..............................0.6 mm on Sunday 24th February.