Ellen J Prager

Describes the formation of sand from materials such as coral, rock, or crystals and shows how it can be moved through water, wind, ice, and other erosion agents.

"Tristan Hunt is having trouble keeping his newfound underwater talents a secret. And if undercover spies and a mysterious illness threatening to expose his special summer camp in the Florida Keys weren't enough, reports of dying fish and disappearing sponge in the Caribbean call Tristan and his friends back into action"--Provided by publisher.

Before she died, Ezzy Skylar's mother made Ezzy's father promise to take his two children on trips to some of the world's most exotic places, starting with the Gal pgos Islands. There's just one problem: while her little brother Luke is in animal heaven, Ezzy has a paralyzing fear of wild animals.

"Thirteen-year-old Tristan Hunt has enough to worry about with girl troubles, his parents, and trying to keep his extraordinary underwater abilities a secret. But when Tristan and his similarly gifted friends are called upon to investigate the disappearance of stingrays and other ocean life in the waters off Grand Cayman, the stakes are higher than they've ever been before"--