Black Holes: Facts, Theory & Definition. Black holes are some of the strangest and most fascinating objects found in outer space. They are objects of extreme density, with such strong gravitational attraction that even light cannot escape from their grasp if it comes near enough.
Chemigation is the injection any chemical such as nitrogen, phosphorus or a pesticide into irrigation water and applied to the land using the irrigation system. The proper use of chemigation is recognized as a Best Management Practice (BMP) for irrigated agriculture.
Words to Know. Calving: Process of iceberg formation in which a glacier flows into the sea and large chunks of glacial ice break free due to stress, pressure, or the forces of waves and tides. Ice island: Thick slab of floating ice occupying an area as large as 180 square miles (460 square kilometers).