A set of more than 450 flash cards presents essentially the most regularly-tested terms and topics at the AP Environmental Science exam with explanations at the reverse side of every card. All AP test topics are covered within the set. This second edition accommodates new diagrams and illustrations as well. The cards measure 4 1/2″ x 2 3/4″ and have a punch-hole in one corner that contains an enclosed metal key-ring-style card holder. The ring allows students to organize the flash cards in any sequence that suits their study needs. A valuable study aid, whether used by myself or in tandem with Barron’s AP Environmental Science test prep manual. BONUS! An exclusive online exam included with the acquisition of the flash cards.