"In 1995, the gray wolf was reintroduced to Yellowstone National Park after a seventy-year absence. All these years later, we can clearly see the cascading effects this has had on the park's ecosystem. This is a spectacular example of a trophic cascade, the term used when an important member of an ecosystem goes missing and many other living things are indirectly affected, causing a chain reaction of events. In the case of the reintroduced wolves...

A young wolf, taken from her pack in Canada to Yellowstone National Park, struggles alone to master the skills of hunting and survival until she finds a lone male and begins a new pack with him.

"Learn about the world's largest ocean--it's sea floor, and the animals that call the Pacific Ocean home. Also read about the people who have explored it and what is being done to keep the Pacific clean"--Provided by publisher.

Discusses the groundbreaking efforts in China to reintroduce the giant panda to its native habitat, and how similar techniques can be used to help other endangered species back from the brink of extinction.

"Using the structure of "The House that Jack Built" and the example of the gray wolf reintroduction to Yellowstone National Park, the interconnectedness of the wildlife that lives in a place and how the presence (or absence) of a single species can impact an ecosystem is explained"--

"It's July on Alaska's North Slope, and scientist Denver Holt is in Utqiagvik surveying nests. Denver has been coming here since 1992, and the snowy owls he studies have been coming here much longer: thousands of years. With its mix of coastal, low-elevation tundra and a rich presence of lemmings, the North Slope is the only area in Alaska where snowy owls regularly nest. How do snowy owls decide where they will nest? How do they manage to arrive...

Discusses how children can help the planet by planting trees, starting an environmental club at school, and learning how to reduce, reuse, and recycle.

Antarctica is the coldest, windiest, driest, and most remote part of the world. No one owns it; only peaceful and scientific endeavours are permitted. Henry delves into the geography, biodiversity, and exploratory history of the world's coldest continent through the diary entries of George W. Gibbs Jr., the first Black person to set foot on Antarctica-- and her father. Henry shares the importance of protecting and understand the landscape and ecosystem...

"The sun explains its role in the movement of water around the Earth, from the lifting of fresh water from the seas, to the movement of underwater currents that nourish the world's oceans. The sun has a hand in moving rivers of water in its liquid, gaseous, and solid states all around the Earth, enabling life to exist on our planet. But human beings are interfering in this natural cycle, unbalancing the amount of fresh water available."--$cProvided...

Hurricane Harvey takes an in-depth look at the destruction wrought by 2017's Hurricane Harvey in Texas and the Gulf Coast and the ensuing cleanup efforts. Features include essential facts, a glossary, selected bibliography, websites, source notes, and an index. Aligned to Common Core Standards and correlated to state standards. Essential Library is an imprint of Abdo Publishing, a division of ABDO.