NGSS's emphasis is on providing students with opportunities to embrace the practices of science and engineering. "Engaging learners in ways that will stimulate their curiosity and creativity will also allow them to better understand the work of scientists and engineers." (Marjorie A. Porter, 2017)
The crosscutting concepts (identified below) are used to encourage and support the unity of all sciences. They are embedded in science activities at every level, and they communicate a scientific way of thinking. They are themes that bridge disciplinary boundaries.
Resources for the Crosscutting Concepts/Unifying Themes
The DCI's are broken into four categories: Life Sciences (LS), Physical Science (PS). Earth and Space Science (ESS), and Engineering and Technology Science (ETS). The following website, "Nextgenscience.org" will provide specific content for your grade level.
Paul Andersen ("Bozeman Science") has created a video for every science standard.
"Don't kill the wonder - and don't hide the practices."