Examines plants, what they have in common, how they can differ, how they grow and reproduce, and how some plants have adapted to different environments.
Women leaders of the twentieth and twenty-first centuries have powerfully influenced the course of major political events and have spearheaded social change on an international scale. Some women were elected to public office and others were appointed to key positions in government. Some were leaders who served in the private sector. All were products of their times and made an indelible mark on those times. Book jacket.
An introductory history of the Oregon Trail and its significance in opening the west to settlers, including information on th people who opened the Trail, their reasons for going west, modes of transportation, and a description of a typical day on the Trail.
Take an exciting trip along with the Lewis and Clark Expedition! Readers will follow the daring explorers as they make their way across the uncharted American interior to the Pacific Northwest.
Describes adventures and disasters in the lives of people who rushed to the gold mines of California in 1848 and explains how this event sparked the state's development.
Each volume presents brief accounts of five women and their inventions, including Sybilla Masters, Madam C. J. Walker, Mary Anderson, and Nancy Perkins.
Imagine vast, flowing, 10,000-foot-thick ice sheets covering much of the land. See huge, elephant-like wooly mammoths roaming the tundra. Picture hunting monstrously large mammals alongside the first humans to travel to a new land. This is not an imaginary world. This is our continent, North America, less than 100,000 years ago! Journey into the distant past with this book and witness the earliest events in North America; when much of the continent was still covered in ice, the last of the giant beasts roamed the land, and human beings expanded into new territories to bring the dawn of their (and our) new world.
Imagine a world with a thick stew of poisonous gases. A world so hot that metals and rock melt. There is no land, no water, no life. This is not Jupiter or Saturn. This is our planet, Earth, over 4 billion years ago! Journey into the distant past with this book and witness the earliest events on Earth; when the land and sea first formed, and the earliest life arrived.
Imagine giant trees over 100 feet tall covering the land. And monstrous salamanders, dragonflies as big as crows, and millipedes over 6 feet long. Picture abundant life everywhere, then witnessing the end of almost all living things. This is not a science-fiction story. This is the story of our planet, Earth, over 250 million years ago! Journey into the distant past with this book and witness the earliest events in what would become North America; when life on land multiplied, grew to giant proportions, and then suddenly disappeared in the largest extinction our world has ever known.
Imagine a world with volcanoes erupting as a single supercontinent slowly breaks apart. Fierce creatures over 16 feet tall and 40 feet long with huge, sharp teeth. Flying reptiles with a 30-foot wingspan prowling the skies. This is not a nightmare vision. This is our planet, Earth, over 100 million years ago! Journey into the distant past with this book and witness the earliest events in what would become North America; when life flourished and the dinosaurs ruled the land, only to be wiped out when a meteorite from outer space exploded on Earth.
This series tells the incredible story of our planet, the formation of our continent, and the events and transformations that have brought the diversity of life that we enjoy today. Learn about the creatures that roamed the Earth millions of years ago. These titles, filled with vivid artwork, show readers which types of animals lived in prehistoric times and where.
Imagine the blooming of the very first flower. Or a 3-ton sloth with massive claws standing as tall as a giraffe. And horses the size of small dogs that have toes instead of hooves. This is not a dream or vision of an artist or author. This is North America over 20 million years ago! Journey into the distant past with this book and witness the earliest events in North America; when mammals rose from the shadows of the extinct dinosaurs to fill the land, and the first flowers and grasslands bloomed.
Presents the basic concepts of this metallic element which is found in the stone used to make buildings and streets and which is an important mineral needed by the body.
Describes how an oil spill occurs; the damaging effects of recent spills on the sea, land, and wildlife; and the difficult process of cleaning up after a spill.
Identifies and tells the stories behind many plants and animals at risk from human action, and describes the political and other factors involved in decisions concerning the various species.
Describes the three-month German bombing of Great Britain in 1940 by the Luftwaffe, the errors made by the Germans, and the courage of the British flyers and the public.
Describes how and to what extent the United States was involved in World War II, including military preparation before the United States actually declared war.
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