There is a very distinct set of skills that we are working to accomplish in the science section of LHFHG, so while the connections may at times be a bit loose, the science scope and sequence is being well-covered in the areas of life, earth, and physical science.
It is good to remember that there are actually 70 hands-on science activities within LHFHG, which is a lot of science for a K or a 1st grader. Coming up with your own science to replace that many science activities within in LHFHG would take some doing. So, I would definitely lean in the direction of doing LHFHG science as written.
The science text actually matches the history readings quite well overall, when you keep in mind that we are matching it to 70 days of history!
My boys have made great connections between science and history as we've done LHFHG. The goal is not really to read through the science text cover to cover, as it is more of a text. Instead, we prefer to use it as a follow-up reference book to help us read a bit more about related topics. This helps us reach the goal with LHFHG for the children to make connections among the various disciplines and think about how science is related to all other walks of life.
We also desire for kiddos to begin to think scientifically and to truly be able to do the experiments/activities we're asking them to do, rather than watching someone else do the experiments because they are too difficult for a typical K or 1st grader to do or understand. To that end, the science in LHFHG accomplishes its goals. On a sidenote, our own boys have all done science this way, and our 3 oldest sons continue to score in the 99th percentile in science on their standardized tests each year. So, while I place little stock in standardized test results, it does show that our boys are strong in science after having done it this way. We have enjoyed the science immensely with our own boys and pray that you will too.
Blessings,
Carrie