Fifty percent of the total mass of the atmosphere is located in the lower 5.6 km (18,000 ft) of the troposphere. It is primarily composed of nitrogen (78%) and oxygen (21%) with only small concentrations of other trace gases.
Having irregular periods is very common. I see them in my practice all the time. The causes can range from something insignificant to something that requires treatment. For example, if you're a teen, your body's hormones can fluctuate and take some time until they find a balance.
What does it mean to have an irregular period? Well, menstrual periods from month to month that can vary more than a few days in length are often considered irregular. Most intervals of womenâs menstrual cycle occur between 24-35 days (the normal range). -- You may also like to know about reasons of late period!