Students often struggle learning all the steps, vocabulary, and chemical formulas of the hydrologic, carbon, and nitrogen cycles. The steps in the nitrogen cycle can be especially confusing for them. To help make the learning of terms easier, cut these cards out and make a game out of it. First, have students (individually or in groups) scramble the cards and them match up terms. Once they have matched the cards, have them form groups, turn the cards over, and play concentration (also known