Every animal has special features called adaptations that help it survive in its environment. For example, a camel’s hump stores fat that can be used for energy in the hot desert. Polar bears have thick fur and layers of fat to stay warm.

Animals have many ways to communicate with one another. Some use sounds, like birds singing or wolves howling, to warn others or mark territory.

Clouds form when water vapor in the air cools and condenses into tiny droplets. Clouds can bring different types of precipitation, such as rain, snow, sleet, or hail.

Our solar system is made up of the sun and everything that orbits around it, including eight planets, moons, asteroids, and comets. The planets are divided into two groups: the inner rocky planets and the outer gas giants.

Butterflies go through an amazing transformation called metamorphosis. The cycle begins when a female butterfly lays eggs on the leaves of a plant. When the eggs hatch, tiny caterpillars, or larvae, come out and begin eating the leaves.

Electricity is a form of energy that powers lights, computers, and so many other things we use every day. Electricity moves through circuits, which are paths that allow electric current to flow.

Magnets are objects that can attract or repel certain metals, like iron and nickel. Every magnet has two poles—a north pole and a south pole. Opposite poles attract each other, while like poles push away.

The ground beneath us may seem still, but it’s actually moving! Earth’s surface is made up of huge pieces called tectonic plates. These plates fit together like a jigsaw puzzle and slowly slide past, collide, or pull away from one another.

Many animals respond to seasonal changes through migration or hibernation. Migration happens when animals travel long distances to find food, better weather, or safe places to raise their young. Birds often fly south for the winter.

The human brain is one of the most complex organs in the body. It controls our thinking, moving, feeling, and remembering. Even though it only weighs about three pounds, the brain works nonstop to keep us alive and aware of the world.

The ocean covers more than 70% of Earth’s surface, but much of it remains unexplored. Scientists divide the ocean into zones based on how deep they are. The top layer, called the sunlight zone, is where most marine life lives.

Plants are amazing because they make their own food through a process called photosynthesis. They use energy from sunlight, water from the soil, and carbon dioxide from the air to create glucose, a type of sugar they use for energy.

Water is always moving around our planet in a process called the water cycle. It begins when the sun heats up water in lakes, rivers, and oceans, causing it to evaporate into the air as water vapor.