In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

[Q]: Japan's Chikyu Hakken is trying to reach this region, and n-waves travel along its upper boundary. Post-perovskite forms in the bottommost part of this region, the D double prime layer. P-waves slow down and S-waves disappear past the bottom of this region, and its top features a P-wave velocity jump from approximately seven to approximately eight kilometers per second. The low velocity zone of the asthenosphere is found in the upper part of this region. It is sandwiched between the Gutenburg discontinuity and the Moho, and this layer's namesake plumes form hotspots. For 10 points, name this layer of the earth between the crust and the core.
[A]: Science

[Q]: This battle started after troops under Henry Heth (HEETH) spotted John Buford's cavalry. Key locations in this battle included the Peach Orchard and Devil's Den. One general in this battle, Dan Sickles, disobeyed orders by moving his corps from its location along Cemetery Ridge. That ridge was the object of Pickett's Charge at the end of this battle. George Meade's victory in this battle ended a Confederate invasion of the North. For 10 points, name this battle whose site was later the location of an Address by Abraham Lincoln.
[A]: History

[Q]: This ruler refused to allow his bishops to attend a council at Mouzon, and during the first decade his reign, he swore nominal fealty to his less powerful cousin Lothair. He appointed Arnulf as archbishop, who refused to attend the Council of Senlis and supported his uncle Charles of Lorraine in a bid to usurp the throne from this man. This ruler then quickly replaced Arnulf with Gerbert of Aurillac, who later became Sylvester II. This ruler's wife was the daughter of William Towhead, Queen Adelaide, and during the last part of his reign he ruled alongside his son Robert II, while he himself was a great-grandson of Robert the Strong. With living descendants on the throne of Luxembourg and Spain, FTP, name this founder and namesake of a line of French kings beginning in 987.
[A]:
History