Christine Petersen

"Investigate Gems introduces readers to what gems are and how they form, including mineral gems and organic gems. Learn about crystal systems, imitation and synthetic gems, cultured pearls, how gems are used, and their historic importance. A geology-themed project provides the opportunity for hands-on experience. Other features include a table of contents, fun facts, infographics, sidebars, map, and an index. Aligned to Common Core Standards and correlated...

"Unearth Fossils introduces readers to the different types of fossils and how they form. Learn about key fossil finds, scientists who made important discoveries and contributions to the study of fossils, and how we use fossils today in the form of fossil fuels. A geology-themed project provides the opportunity for hands-on experience. Other features include a table of contents, fun facts, infographics, sidebars, and an index. Aligned to Common Core...

"Discover Rocks introduces readers to what rocks are and how they form. Real-world examples bring to life igneous, sedimentary, and metamorphic rock. Full-color photographs will draw in readers while the easy-to-read text breaks down complex concepts. A diagram of the rock cycle ties everything together and a geology-themed project provides the opportunity for hands-on experience. Other features include a table of contents, fun facts, infographics,...

Want to go to a place where there are hundreds of waterfalls, trees as tall as skyscrapers, and towering slick rock mountains just begging for climbing? If so, you'll love visiting Yosemite National Park. This stunning park is located in California. It is where the giant sequoias live, some of the world's largest trees. The biggest tree called the Grizzly Giant which is in Mariposa Grove is 30 stories tall, its base is 96 feet with branches as...