Earth Systems

The only planet to support life, Earth has a lot going for it. Think you know everything there is to know about our home planet? Think again. Discover more about the blue planet we call home.

Soil covers most of the land on Earth. It feeds plants and is home to many animals. Discover why soil is an important part of nature!

Erosion changes Earth's natural features. It breaks down materials and can help make something new. Discover why erosion is an important part of nature!

Different kinds of rocks are found on Earth. Many are found deep inside Earth. Discover why rocks are an important part of nature!

The energy in our bodies is connected to the unlimited energy of the universe itself. When we are stressed and living with chronic anxiety, our autonomic nervous system (ANS) is usually out of balance, disconnected and stuck in a 'fight or flight' mode. This can cause a range of long-term physical and mental health problems. The harmonic sounds in this premium audiobook are specifically designed to calm the autonomic nervous system and put you on a 'rest, relax and repair' mode where the mind can still and the body can begin to heal.

All living things need air to survive. Air also protects Earth. Discover why air is an important part of nature!

Plants and animals from millions of years ago left behind fossils. Fossils can teach people about the past. They are also used for fuel. Discover why fossils are an important part of nature!

Most of Earth is covered in water. Water falls from the sky as rain or snow. All living things need water to survive. Discover why water is an important part of nature!

Everything is going according to plan. Ivan Susanin has successfully installed a beacon in the undead territory and returned home. The situation changes when the next mission to the city of goblins is delayed, while his home planet becomes the battleground. Monsters invade Earth, and Ivan must become one of the leaders and unite the players under his banner, albeit within the borders of his own country. If circumstances demand that he discloses his identity and cooperates with the authorities, so be it! Modern weapons and equipment, instructors, financing, and protection by law....

Fire is rarely out of the headlines, from large natural wildfires raging across the Australian or Californian countrysides to the burning of buildings such as the disasters of Grenfell tower and Notre Dame. Fire on these scales can represent a serious risk to human life and property. But the advent of fire made and controlled by humans also represented a crucial point in our evolution, allowing us to cook our food, forge our weapons, and warm our homes.

The Alcazar station has been attacked! Project Ibex, under the command of former teammate Irene has begun cutting a bloody path throughout the galaxy, delivering a single message. Humanity has arrived! From Tachyon to Boron and beyond Hrafn squad will pursue the Veles across the galaxy. Alliances will be forged; enemies will be made and the thin red line between hero and villain will be towed in the name of peace.

Since its 2009 launch, the Kepler satellite has discovered more than 2,000 exoplanets, or planets outside our solar system. More exoplanets are being discovered all the time, remarkable in their variety. Astronomer Michael Summers and physicist James Trefil explore these remarkable recent discoveries: planets revolving around pulsars, planets made of diamond, planets that are mostly water, and numerous rogue planets wandering through the emptiness of space.

The sun's family of planets become a familiar place in this personal account of the lives of other worlds. Sobel explores the planets' origins and oddities through the lens of popular culture, from astrology, mythology, and science fiction to art, music, poetry, biography, and history. This intimate account is filled with fascination, beauty, and surprise.

If a black hole is not a hole, then what is it? Find out what black holes are, what causes them, and how scientists first discovered them. Learn how astronomers find black holes, get to know our nearest black-hole neighbor, and take a journey that will literally s-t-r-e-t-c-h the mind.