Search Results

Fossils give us a window to the past. Water, sediments, and pressure work together over time to preserve the shape of things that lived long ago. Studying these ancient plants and animals… Read More →

Rocks can be made of many different minerals. By looking at rocks closely, we can tell where they were formed and what conditions they were created in. How do we know these things? And how do Read More →

Soil can be found almost everywhere on Earth. Sand is a soft soil that is found in deserts. Loam is soil that is great for growing plants. But how are these types of soils different? And how… Read More →

The outside layer of our planet is an active place. Earth's crust is always growing and changing. But do you know how Earth's crust forms? And what happens when its plates shift suddenly?… Read More →

The circulatory system is made up of the heart, the blood, and strong tubes called blood vessels. But what does the circulatory system do? And how do its parts work together to keep your body Read More →

The digestive system is made up of the tongue, the esophagus, the stomach, the intestines, and other parts. But what does the digestive system do? And how do its parts work together to keep… Read More →

The muscular system is made up of three different kinds of muscles: skeletal muscles, smooth muscle, and heart muscle. But what does each kind of muscle do? And where in the body are they… Read More →

The nervous system is made up of the brain, the nerves, and the spinal cord. But what does the nervous system do? And how do its parts work together to help your body function? Explore the… Read More →

The respiratory system is made up of the nose, the throat, the lungs, and other parts. But what does the respiratory system do? And how do its parts work together to keep your body healthy?… Read More →

The skeletal system is made up of about two hundred and six bones. But what exactly is a bone? And how do bones help your body function? Explore the skeletal system in this engaging and… Read More →

What are checks and balances? They are limits that keep different parts of government from having too much power. But just what are these limits? And how do they help our government run more… Read More →

What are the Declaration of Independence, the Bill of Rights, and the U.S. Constitution? They're important documents that helped to shape our country. But what's the story behind how these… Read More →

Have objects from space ever hit Earth? Yes! Every day small meteoroids crash into the atmosphere. Some burn up, but some hit the ground. Space junk also falls to Earth. Comets and asteroids… Read More →

Could there be other planets in the universe similar to those in our solar system? Yes! Scientists have discovered worlds circling distant stars. They call these objects exoplanets. In this… Read More →

What does it mean to be elected to political office? It means you get to decide how to make a town, a state, or even the whole country a better place to live. But how does someone get… Read More →

What is the judicial branch? It's the part of government that's in charge of our courts. But just what do the courts do? And how do they affect your daily life? Read this book to find out. Read More →

What is the legislative branch? It's the part of government that makes our country's laws. But just how does the legislative branch make a law? And what else does this branch do? Read this… Read More →

What is the executive branch? It's the part of government that's led by our president. But who else is part of the executive branch? And just what does this branch do? Read this book to find out. Read More →

What space objects can have millions of times more mass than our Sun, but they remain invisible? Black holes! Their gravity is so strong that not even light can escape. In this book, you'll… Read More →

How can robots help us explore space? A probe called New Horizons is zooming through the outer solar system. It's headed to Pluto. It and other space robots can go where people cannot… Read More →