Explore the concept of time on Earth with this Class 9 Geography chapter covering GMT, IST, meridians, and the International Date Line. Understand how Earth’s rotation affects time and dates, why days change while crossing the IDL, and how global travel and transportation schedules stay coordinated through practical examples and activities.

Explore The Properties of Sea Water. Learn about the temperature, salinity, and density of seawater, how they vary with depth and location, and their effects on ocean currents and global climate. Includes activities, experiments, and exercises for students to understand concepts like the Dead Sea’s salinity and water temperature balance.