what is amethyst? bc i have an amethyst crystal, my aunt says it helps with bad dreams and stress but how does it help, i also have green quartz, clear quartz and rose quartz

Why don't all places on earth receive the same amount of direct sunlight at the same place?

You are a scientist who has been sent on a special mission to study plants and animals in south asia! your destination is an important forest in eastern india. you need to travel to 17°n latitude and 83°e longitude. which star should you travel to?

Distance that the transcontinental railroad covered from omaha to san francisco.