instruction:
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.
question:
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.
answer:
Science

question:
Hans-Georg Gadamer argued that the ideal described in this work is heuristic in nature in an essay about this work's author "and the poets. " Books six and seven of this work assert that knowledge is ultimately for the Good, which shines on intelligible essences like the sun. It asserts that love is "a tyrant" over man, and compares imaginative, real, intelligent, and abstract levels of thought to a line divided into four segments. In its first book, Thrasymachus describes justice as "the advantage of the stronger," while its seventh book likens people unaware of Forms to humans viewing shadows on the wall of a cave. For 10 points, name this Platonic dialogue that describes an ideal society.
answer:
Social Science

question:
The spherical helix is the tangent indicatrix of a curve of constant this. A relativistic form of it occurs for bound electrons due to their being in non-inertial frames and is named for Thomas. Vector quantities generally undergo this phenomenon when orthogonal to their time derivatives. A second-order type of this motion is called nutation. Analysis of the best-known type of it requires the understanding that the torque due to gravity is the time derivative of the angular velocity. FTP, name this physical phenomenon, a periodic change axial direction of a rotating object, exhibited by gyroscopes and spinning tops.
answer:
Science