How Rivers Begin, Grow, and Flow Toward Lakes or Oceans

How Rivers Begin, Grow, and Flow Toward Lakes or Oceans

A huge river can look powerful enough to have always existed in the landscape. Yet even the largest rivers usually begin in a much smaller and less dramatic way. A trickle from a mountain spring, melting snow, rainfall running downhill, or groundwater emerging from the earth can all contribute to the beginning of a river. … Read more

How Weather Forms Through Changes in Air and Water

How Weather Forms Through Changes in Air and Water

One morning can start with clear blue skies and end with heavy rain, strong wind, and thunder. Weather sometimes seems unpredictable, but every cloud, breeze, shower, and storm develops because physical conditions in the atmosphere are changing. Two of the most important ingredients are air and water. Understanding how weather forms through changes in air … Read more