Our freshmen take physical science. I incorporated Earth Systems as much as I could integrating with physics and chemistry topics. In my rural setting, I focused on water and tied that into all of my science courses.
Twice a week we started class by reviewing the weather maps for the entire year; Monday, students were interested in the weather looking ahead in the week for activities, sports, and even what to wear. Thursday we revisited the weather to see how it may have changed and to prepare for the weekend.
I incorporated forces and motion with an avalanche unit that connected to materials chemistry. More importantly that relates to meteorology and hydrology.
Teaching in a rural school, I found it easy to incorporate place-and project-based instruction and activities that incorporated what we now call cross-cutting concepts.
I know this is a bit late but how are you doing now with NGSS alignment?