... years ago when the entire planet looked something like Lake Vostok, some Columbia University biologists believe. These biologists envision a primitive "snowball Earth" covered in ice with small pockets of water heated by geothermal vents. These geothermal vents may create a sort of time capsule into the past. They may have protected many different microbes from early eras causing a sort of ... ," says Chris Mckay (Space Daily, 2003). Another scientist, Dr. Peter Doran of University of Illinois at Chicago, says, "We need to consider the implications of the supercharged water very carefully...

• Word Count: 2522
• Approx Pages: 10
• Has Bibliography
• Grade Level: High School

... adds seasonal character to the landscape and a serene refuge from the demands of daily living. Australia suffers greatly from salinity and rapidly rising water tables. The primary cause of dry land salinity is the clearing of native bush. Unless re-vegetation occurs, much land will eventually become ... a growing population, white settlers cleared billions of trees and much of the supporting vegetation. Little did they know that their actions would cause water tables started to rise, bringing salt to the surface. The consequences have been enormous. Salinity costs us around $270 million ...

• Word Count: 2774
• Approx Pages: 11
• Grade Level: High School