Describes how the construction of a six-lane highway in a wilderness area disrupts the balance of nature and forces the animals there to struggle for existence.

Looks at some of the visible ways that the earth can be changed in a matter of minutes, and discusses how the natural forces involved in earthquakes and volcanoes can raise mountains, build islands, change weather and help to produce varieties of plants and animals.

Discusses the value of jungles and rain forests and the reasons why they have become endangered.

Looks at the element that covers nearly three-quarters of our planet, and describes the water cycle, ocean waves and river currents, and the threat that human carelessness and exploitation pose.

Explore the history and development of the airplane and find out how an airplane works. Learn about the inventors who helped influence the invention of the airplane.

If a picture is worth a thousand words, then an Instagram profile is worth millions! People everywhere now share photos and videos of their lives with followers around the world via Instagram. Inside, read how this super-hot app company started and how it has transformed visual communication . . . and how it is planning to change it even more in the future! Social media companies have changed the way that people in every generation communicate