Rose Houk

Land Lines

We tend to think that rivers flow in a consistent direction: downstream. But over geologic time “downstream” can change. That’s why a place like Unaweep Canyon in western Colorado is such a good place to think about long-term time travel.

Courtesy

When presidents approach the end of a term, an otherwise little-known federal law often hits the headlines. It’s the Antiquities Act, passed by Congress in 1906.

How do we know who lives where? Increasingly, land managers are turning to a fun and educational event to find out: the bioblitz.

Northern Arizona Audubon Society

Each spring, common black hawks soar into Arizona skies from their wintering grounds in Mexico. These large, coal-black raptors, with distinctive white-banded tails, spend the warmer six months of the year here breeding, nesting and raising young.

Springs are magical places where groundwater comes to the surface — lush green patches that are among the most diverse, productive, and threatened ecosystems on Earth.

Pages