1.2.1.formed under frontal condition 1.2.2.formed when warm air encouters a cold surface as it moves along a horizontal plane
1.2.3.formed when air moves slowly upwards along a gradual slope and is cooled adiabatically
1.2.4.formed when nights are cold ; clear and cloudless
1.2.5.winds that blow upward during the day
1.2.6.winds that blow downslope during the night
1.2.7. formed where conditions of heating and cooling occur regularly in a valley
1.2.8.region in a valley where there is no direct heating from the sun​