Stowing away in wooden shipping materials, the Emerald Ash Borer sneaked into Michigan from northeastern Asia around 2002.
You probably know that counting the concentric rings in a cross-section of a tree trunk can tell the tree’s age. But that’s just the beginning of the wealth of information contained in the rings. Scientists can examine and test the rings to uncover years, even centuries, worth of knowledge about climate, atmospheric changes, and local geography.
As urban areas are built up, the rain falling on them runs off rooftops and paved areas into storm sewers that carry it away. Instead of falling onto open ground, where it’s filtered by soil and plants, it typically flows through the sewers directly into a nearby river or stream, carrying pollutants such as oil and chemical products along with it.
1 2 3 >