Extinction: 100 Years Since Martha

I remember reading the story in the Scholastic News as a kid – a species of bird so numerous that when it migrated it completely blotted out the sky, sometimes for days.  An abundant species so hounded by hunters that within a human lifespan they were completely gone.  100 years ago today Martha, the very […]

Glossary

A Acre – 43,560ft2 Acre-foot – (Acre-ft, AF, AC-FT) The volume of water that would cover one acre of land (43,560 square feet, about the size of an average football field) to a depth of one foot, equivalent to 325,851 gallons of water. An acre-foot is the basic measure of agricultural water use. The average […]