Landforms
Why Rivers Meander Across Nearly Flat Ground
Why rivers meander across nearly flat ground comes down to gravity, erosion, and deposition. Learn to read bends and…
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All readings
Browse explanations of landforms, weather, water, deep time and the processes changing our planet.
Weather
Dew Point or Relative Humidity: Two Ways to Describe Moist Air
Dew point or relative humidity tells you different things about moisture. Learn how to read both and explain why…
Water
The Long Journey of a Drop in the Water Cycle
Follow one imagined drop through the water cycle and distinguish evaporation, condensation, precipitation…
Deep Time
How Fossil Succession Reveals the Order of Deep Time
Fossil succession helps readers compare rock layers, recognize gaps and establish relative age without mistaking…
Planet Change
A Walk After Rain: Reading a Hillside for Signs of Erosion
Read hillside erosion after rain by tracing runoff, sediment, and surface marks from a safe viewpoint, without digging…
How we look
The planet makes more sense in motion
A river, a cloud and a mountain are not static things. Follow the processes behind them and the larger story comes into view.