Autorentext

Julie K. Lundgren grew up in northern Minnesota near Lake Superior. She delighted in picking berries, finding cool rocks, and trekking in the woods. She still does! Julie's interest in nature science led her to a degree in biology. She adores her family, her sweet cat, and Adventure Days.

Klappentext

Planet Earth formed over 4 billion years ago. As Earth cooled over millions of years, an ocean formed. Scientists believe this ocean once covered the entire planet. Discover the changes our planet has gone through over time and how those changes affected our oceans.