Science is no longer taught to young children since they are not tested with a high stakes test in science until middle school! Although everyone has made great points about why young children are natural learners for a science it unfortunately seems that fewer schools are addressing science curriculum at the early grades.
Science is "cool," and it can be taught using ordinary items and examining ordinary things. Kids are the masters of asking "why," and science can often answer those questions. This kind of natural curiosity lends itself to exploring (which is really just the early stages of researching) and questioning, two key components of scientific study. Taking advantage of that natural curiosity and wonder is key to teaching science--actually, to teaching anything.
Younger children are naturally curious, and have much more capacity for imagination than adults or older students. You can capitalize on this in the classroom, the lab and outdoors by teaching them hands on, interactive science that relates to what they see everyday - the stars, the sun, clouds, weather, soil, bugs - kids love that stuff. Kids do have shorter attention spans too, so it's sometimes good to plan short lessons with hands on experience. They'll stay engaged longer.
the way they learn?
like some are visual and some kinesthetic. Some listen and some prefer to speak. You know the 5 diff ways of learning. So if a child is kinesthetic than doing science practicals are better. If not than for a visual learner seeing animations or these pracitcals.