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Questions in Grade Middle-school

[Done] Why does Alaska have really long days during some times of the year and really short days during other times?

[Done] I need help solving the following equation: \[ \frac{7k}{8} - \frac{3}{4} - \frac{5k}{16} = \frac{3}{8} \]

[Done] What is a subspecies?

[Done] Why do people tell actors to "break a leg"?

[Done] What is a cardinal?

[Done] How does hail form?

[Done] What is a group of snakes called?

[Done] What is smog?

[Done] What is quicksand, and how does it work?

[Done] What was the Battle of Wounded Knee?