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This learning activity uses data acquired by the TOPEX/Poseidon altimeter, a joint project of NASA and the French Space Agency, to investigate the relationship between the topography of a sea-floor feature and the topography of the overlying sea surface.

Soil moisture is the water that is held in the spaces between soil particles, generally in the upper 10 cm of soil; this small amount of water plays a critical role in controlling the transfer of water and heat energy between Hydrosphere, Biosphere, and Geosphere.