Cambia constantemente, la Tierra a veces revela indicios acerca de las plantas, animales y otros organismos que vivieron hace mucho tiempo. Los fo?siles nos ensen?an mucho acerca de lo que era la vida hace millones de an?os, respondiendo a las preguntas de ?co?mo ha cambiado la Tierra y tal vez incluso por que? cambio?.
An introduction to rocks and minerals, describing fifteen common varieties, five types of fossils, and seven different arrowheads and artifacts, with illustrations and instructions for related activities.
Scientists have learned from fossils that Diplodocus was a giant, plant-eating dinosaur that lived in herds and defended itself with its whip-like tail.
Scientists have learned from fossils that Stegosaurus was a large, slow, plant-eating dinosaur with bony plates on its back and spikes on its tail that it used for defense from predators.
An introduction to fossils, explaining what they are, how they form, and where they are found, with brief profiles of scientists who study fossils, additional science facts, and photographs.
Explores the history and science of ten of the most frightening dinosaurs, including the triceratops, kronosaurus, masiakasaurus, and troodon, and includes humorous illustrations, fact boxes, and sidebars.
