HOW DO GLACIERS FORM? WHAT ARE ICE CAPS? ICEBERG FIND OUT MOREAt the poles and on high mountains, vast areas are covered in ice—in rivers of ice called glaciers, and in layers of ice called ice…
Galveston Storm SurgeWeatherBlowing Cold and Hot: The Big OnesWinter Gone SouthBig-City SnowsStorm of the Century?The Greatest One of AllModern Winter of Deep SnowsGalveston Storm SurgeThe Great New…
(Encyclopedia) Ballard, Robert DuaneBallard, Robert Duanebălˈərd [key], 1942–, American marine geologist, b. Wichita, Kans.; Ph.D. Univ. of Rhode Island, 1974. From 1969 to 1997 he was associated…
(Encyclopedia) subduction zone, large-scaled narrow region in the earth's crust where, according to plate tectonics, masses of the spreading oceanic lithosphere bend downward into the earth along the…
(Encyclopedia) skin diving, act of swimming freely underwater. It is done with the aid of a face mask, swimming fins for the feet, and either a snorkel breathing tube or scuba [acronym for self-…
Source: National Institute of Allergy and Infectious Diseases, National Institutes of Health. The problem. In the course of a year, individuals in the United States suffer one billion colds,…
Most animals never even see their parents! Many never meet their fathers and some never meet their mothers, either. Some insects, fish, amphibians and reptiles hatch from fertilized eggs and face…
Fighting FungusFungal InfectionsIntroductionTypes of InfectionFungal Infections of the SkinFighting Fungus As noted earlier in this section, the strength or weakness of the body's immune system is…
(Encyclopedia) myasthenia gravismyasthenia gravismīəsthēˈnēə gräˈvĭs [key], chronic disorder of the muscles characterized by weakness and a tendency to tire easily. It is caused by an autoimmune…
(Encyclopedia) heartburn, burning sensation beneath the breastbone, also called pyrosis. Heartburn does not indicate heart malfunction but results from nervous tension or overindulgence in food or…
