debeer1-4, Exercise 1: Ale and lager compared

Model answer:

Temperature: ale ferments warmer (roughly 15 to 24 degrees Celsius), lager cooler (roughly 7 to 13).
Where the yeast works: ale yeast gathers at the top as foam, lager yeast settles at the bottom.
Speed: ale is fast, a matter of days; lager is slower and is followed by weeks of cold storage.
Character: ale is typically fruitier and rounder, lager cleaner and crisper.
German examples: ale: Weizen, Kölsch or Altbier; lager: Pils, Helles, Märzen or Bock.