Answer:
Studying hours.
Explanation:
Studying hours should the third variable that correlates the other two. Since that higher self-esteem should motivate students to study more, and that hours are going to get higher grades. So, depending on how many hours they dedicate to study, grades are going to raise, it's like a cycle in this case.
Many cultures use fireworks to celebrate various holidays, however, the chemicals used in fireworks and pyrotechnics can have negative effects on our environment. It still makes people feel happier when they watch it. And fireworks have been a new yearly culture in Bahrain National Day.
Bahrain National Day is one of the biggest events of the year, and there are plenty of things to do in 2020 to keep you entertained one of them is the fireworks show. On the 16th of December, lighting firecrackers and fireworks are a major custom to celebrate the coming of the National day, and also a way to enhance the festive atmosphere.
So, even though lighting firecrackers produces a loud noise nuisance and piles of red paper shreds, Bahraini people not only take it in their stride but also generally enjoy firecracker.
It just really depends on the situation at hand i guess
