Each year, more 1.6 million students take the ACT. In order to perform well on this high-stakes exam, students must have a solid grasp of vocabulary and science terms. This portable guide features 600 essential ACT flashcards, bound in a convenient book format, featuring definitions, sample sentences, synonyms, and a pronunciation key. The cards include the most-tested vocabulary on the exam and the science terminology that comes up from year to year.