by Mark Twain ; adapted by Monica Kulling.
Lynne Cherry.
by Mary Pope Osborne ; illustrated by Sal Murdocca.
All eleven-year-old twins Oliver and Celia Navel want to do is watch television, but their explorer father takes them in search of El Dorado, the Lost City of Gold, and their long-lost mother.
Fascinating overviews of the processes that shape our planet.