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Gr 2–3—Transitional titles between easy readers and beginning chapter books, these stories have about 1000 words, four to five chapters, longer sentence structures mixed with short sentences, short paragraphs, and some challenging vocabulary...
Gr 4—8—An introduction to the general topic is followed by 13 spreads, each answering a question such as, "Why Does the Gateway Arch Sway in the Wind?" (Amazing Built Structures) or "Why Doesn't a Microwave Oven Get Hot?" (Everyday Appliances)...