Hiya and I don't believe there's warcraft material suited for ages 6 or below, blizzard should get on that!
high elves started calling themselves blood elves after Arthas nearly killed all their people
He died, killed by blackhand
Well of eternity -> Demon soul -> the sundering
Haha seen this question pop up a few times with other community members. My personal favorite is soloing old raids. Cata raids earn you around 10k each week
They're not aspects, they were created from black dragon eggs as Draenor turned into Outland. Nether drakes are the immature members of the netherwing dragonflight that are believed to be the spawn of Deathwing, but were affected by the incredible energies released by the destruction of Draenor. Living in Draenor's ruins, now known as Outland, the nether drakes are available as flying mounts to swiftly transport players around the shattered world. http://wow.gamepedia.com/Nether_drake
Uncertain, Possible that it just disintegrated into goo or perhaps it's in the Lordaeron box that you can found in SW cemetery.
In a world where magic plays a big part, I'd assume so. Either that, or external influences
Nope, not as far as we know
Possible or perhaps it's a Caverns of Time kind of thing
As a demon hunter grows in power, they undergo a gradual evolution, becoming more and more demonic in appearance. The changes are cosmetic and can take many different forms, from burning eyes to black blood. By the time the demon hunter reaches the pinnacle of his development, he is a twisted and dark version of his former self - though the chaotic energy in his body does not affect his personality and allegiance (or so the demon hunters claim), it wreaks great changes on his physical form. The demon hunter’s gradual evolution achieves its pinnacle as they become a demonic entity. Their appearance has changed to something frightening: The exact changes vary, but can include glowing red eyes; horns; clawed feet and hands; nonfunctioning wings; cloven hooves; a spiked tail; dark skin; a deep, rumbling voice; and similar cosmetic changes. The demon hunter becomes an outsider. http://wow.gamepedia.com/Demon_hunter