i am guessing the author wanted the book to seem authentic and spelled magick the right way. I think she was basing their religion (at the school) on wicca and she tried to get as many facts right as she could.
Magic spelled this way is show magic. Magick spelled this way is real magick or religious magick.
Because they author decided it was more unique. She didn't want her vampire to be spelled the same. Same as if you read a book and it says magick instead of magic.
No, you can not "get magick" but you can study and practice magick.
As far as I can tell, it was originally spelled "magic." The K was added in the late 19th century to differentiate true magic from the stage illusions that were becoming popular; that, "magic" became "magick," and "magician" became "magickian" (and I have no idea how that second word is pronounced.)
Black magick is originated in the early ages of civilization when Witches did bad things on purpose which divided the magick into 'black' magick, evil dark magic, and 'white' magick is good and pure.
magic,spells,and potions.com
The 20th book in the Magic Tree House series is Dingoes at Dinnertime.
Mary Pope Osborne writes the books in the Magic Tree House series.
Firstly, there is no such thing as black magick. Magick is a tool, much like a hammer. With a hammer, you can build a house or tear one down. Same concept applies with magick. Magick is colorless, but the people who weld it give it its' intention. Second, The term "witch" means one who practices witchcraft or magick. So, if you take out the "black" in your question, then I can safely say, yes, witches use magick since the meaning of witch defines it as such.
The 3rd book in the Magic Tree House series is "Magic Tree House #3: Mummies in the Morning".
It is possible for any person to use Magick.
She started writing the Magic Tree House series in 1982.