Science is a way to learn truths about the natural world through logic and experimentation. The goal of a science education should be to learn truths that have already been discovered and to learn scientific methods for further discovery. Kids should be taught the strengths and weaknesses of science and how to tell if an argument based on science is valid or not.
Here are some general concepts or skills that are important for all the sciences.
Biology is the study of living things and living systems. It intertwines with chemistry, earth science, and physics. Biology is the most complex of the sciences. Humans are still in the infancy of understanding living things and systems.
Earth Science involves the study of the Earth, the processes that make it change and recycle, the weather, and the sun, planets, and stars. It is the non-living part of our universe.
Chemistry is the study of the microscopic and sub-microscopic atoms and elements that combine to make all the stuff, living and non-living, in the universe. You need to know at least a little chemistry to understand earth science and biology.
The science of physics describes the most basic of laws of the universe, things like motion, gravity, and light. Of all of the sciences it is the most precise, mathematical, and elegant. Though it is far from simple, it is the simplest of the sciences.