To summarize, the hydrologic cycle is the continuous movement of water from the oceans to the atmosphere, from the land-back to-the-sea step is the primary action that wears down Earth's land surface. In this chapter, we first observe the work of water running over the surface, including floods, erosion, and the formation of valleys. Then we look underground at the slow labors of groundwater as it forms springs and caverns and pro vides drinking water on its long migration to the sea.
To summarize, the hydrologic cycle is the continuous movement of water from the oceans to the atmosphere, from the land-back to-the-sea step is the primary action that wears down Earth's land surface. In this chapter, we first observe the work of water running over the surface, including floods, erosion, and the formation of valleys. Then we look underground at the slow labors of groundwater as it forms springs and caverns and pro vides drinking water on its long migration to the sea.
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