Seeker
Seeker: Week of 3 17 14: Active Volcanoes Revealed on Venus
Active volcanoes have been discovered on the planet Venus. Learn what this means about our understanding of this planet.
Houghton Mifflin Harcourt
Harcourt: Biographies: William Clark (Spanish)
Learn about the talented explorer William Clark who helped provide some of the first information about the new Louisiana Territory. William Clark had a life full of experiences that helped prepare him for this great adventure. (In Spanish)