This is why I hate textbooks. I've been teaching for 13 years and I rarely use one. I have one for math that I use more as a guideline for which topics the kids need to learn in order for the concent to flow from one grade level to the next, but textbooks are typically pretty terrible. I almost never use them for teaching science. Unfortunately, almost all the time teachers have little or no say in which books they use. I'm lucky to be in a school where we make most curriculum decisions ourselves (as long as we cover everything we need to).
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It is possible to make a change in your school, though. You can look into being on the committees that select books. Or you can raise holy hell yourself. A old friend of mine did that when he noticed all the errors in his daughters' science books. He complained to the teacher, then the school, then the school board and superintendent, then the publisher, etc. He ended up making some waves in the news in the end, and the school system put out an addendum with corrections. Actually, I just googled him and found this: http://www.textbookleague.org/71erie1.htm. He didn't make many friends in the school system, but he did make some changes!
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ETA: Here's another article that talks about general issues with textbooks, specifically science. But other subjects have the same problems. http://mathforum.org/kb/thread.jspa?forumID=66&threadID=191067&messageID=713878