Teacherwith2kids, for my sins I have to spend quite a lot of time offering differentiation advice on science (which I have absolutely zero grounding in) wrt a cohort of students with severe language disorders. It is undoubtedly the most difficult part of my job.
My students tend to be pretty okay with the practical application of skill, but the technical nature of the language and - as they progress towards GCSE - the sheer quantity of key words necessary to grasp the curriculum or answer an exam question.
As I mentioned up-thread, I also work more broadly across the age range, and some of the Early Years "Sciencey" topics (minibeasts etc) are great and do focus on that spirit of exploration, comparison etc. However, by the time you get to forces/materials etc.. I wonder if there is too much of a focus on technical language sometimes and too much to cover - air resistance, gravity, balanced forces etc. Are these names and the time expended on teaching them really that important? I think for younger children the experience of finding things out with objects etc and discussing these things in a plain English fashion makes a lot more sense. I can't see any sensible reason why a 10 year old really needs to remember a definition for air resistance, to be honest. I think at primary, children need to use the language that is theirs, and learn to use it well (including writing here) and to consolidate the basics e.g. of numeracy vs be expected to recall and retain meaningless jargon.
I'm always reminded of the breadth of the curriculum when I come to Pivats, where the skills are broken into small steps and seem never-ending. For students like mine, who really need an explicit, step by step approach with much room for overlearning, it can be quite a challenge to cover the range of knowledge and skills covered in the primary school curriculum and frankly, I've yet to see how all the work that goes into it really reaps rewards in the secondary curriculum.
So while I do appreciate that all curricula have their down-sides, I think that attempting to cover everything can lead to retention of nothing, and focusing on some key knowledge and moving from knowledge to understanding to application (e.g. combining knowledge/skills in a consolidated way that a decent amount of time can be spent on) might be best.
Though I don't know. I find it extraordinarily difficult wrt Science. I wish I wasn't in the position of having to have anything to do with it.. and I can tell you right now, as someone who is not a Science teacher by background, trying to support students in learning it without that content knowledge, and trying to mediate my knowledge about what the students need in terms of their learning with the demands of the curriculum while triangulating this with the knowledge of the class teacher is a really hard feat. I have LOADS of skills for supporting learning in these students, but I lack content knowledge... and it's NOT enough that I know where to find it out.