Kaltura Share to Google Classroom 12,000 years ago, the beach was 70 miles from Charleston. Visit the modern-day salt marsh - one of the most important ecosystems on the planet. Grades: 6 7 8 9 10 11 12 Subjects: Social StudiesEarly CulturesS.C. HistoryFirst People & Early ExplorersScienceEarth ScienceEarth's Natural ResourcesLife ScienceEnvironments & Habitats Collection: ArchaeologyEnvironmental AwarenessNative American Heritage Series: Ring People