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In some parts of the world sea levels are increasing, while decreasing in others, and remain relatively flat in a few places; for more than 20 years, NASA has been tracking the global surface topography of the ocean to understand the important role it plays in our daily lives. 

The Earth is a system of interacting parts that work together to form our complex planet; it is made up of five major parts or subsystems: Atmosphere, Hydrosphere, Biosphere, Cryosphere, and Geosphere which are connected to each other in a complex web of processes.

Freshwater is found in lakes, rivers, soil, snow, groundwater and ice, and is one of the most essential of Earth's resources, for drinking water and agriculture. However, the distribution of freshwater around the planet is changing.