Kathleen Weidner Zoehfeld is the award-winning author of more than seventy books for children. She has written several books in the Let s Read And Find Out Science series, including: WHAT LIVES IN A SHELL?, an NSTA/CBC Outstanding Science Trade Book and winner of the American Association for the Advancement of Science s Best Children s Book award; WHAT IS THE WORLD MADE OF?, a Children s Book of the Month Club Main Selection; WHAT S ALIVE?, also named an AAAS Best Children s Book; HOW MOUNTAINS ARE MADE, an NSTA/CBC Outstanding Science Trade Book, DINOSAUR TRACKS, "a great choice for even t...