Science Flash Cards PDF, For 1st to 6th Grades kids. These flash cards cover various science topics dealt with in 1st, 2nd, 3rd, 4th, 5th, 6th grades. Topics covered include: classification of animals, ecosystems, heat flow, electricity and magnetism, vertebrates and invertebrates, classification of animals either as reptiles, amphibians, birds or fish, learn about Earth processes, folding and faulting, mountain formations, extinction and fossils. Each card can be cut up based on the shape. Teachers can use these cards to create a flash card collection for reviewing various topics both at home and in the classroom. Start making your collection by clicking on the links below.