What Is A Star? A star is a giant, glowing ball of gases held together by gravity. The main gas in a star is hydrogen. Stars come in different sizes, colors, and temperatures.  A star produces great amounts of energy in the form of light and heat. The Sun is a star. ...

Why Do Leaves Change Color? The green color of leaves comes from the pigment called “Chlorophyll,” which helps with photosynthesis.  Leaves change color in the fall due to changes in the amount of daylight and temperature. The days get shorter, and the temperature...

Why Do Dolphins Live In Groups? Dolphins are highly social animals that live in groups called pods for some key reasons. Protection from Predators - They can collectively defend themselves from predators like sharks. Cooperative Hunting - They collaborate to fence in...

What Are Coral Reefs? Coral reefs are like underwater cities made of tiny animals called “coral polyps.” Stony corals make up most coral reefs.  Coral reefs form in shallow waters of tropical and subtropical regions. The coral reef ecosystem provides a habitat for a...

How Do Spiders Build A Web? Spiders are nature’s engineers who build intricate and symmetrical webs. Spiders have special organs in their abdomen called spinnerets that spin silk threads.  The spider first releases a silk thread...

How Are Snowflakes Formed? Snowflakes get their unique shapes from the conditions in which they form and grow in the atmosphere.  The shape is determined by temperature, humidity, and how it moves through the cloud.  Icy Crystal Formation - A snowflake starts as a...

Why Do Worms Live In Soil? Worms live in soil as it provides them with the habitat they need for their survival. Moisture -  Worms need a damp and humid environment to live in. They need moisture to breathe through their skin. Protection -  The soil offers protection...

What Is A Pulley? A pulley is a simple machine that consists of a wheel with a groove around it and a rope that runs along the groove. Mechanical Advantage - Pulleys are used to lift heavy objects easily. By using multiple pulleys in a system, we can reduce the amount...

What Is A Mirage? A mirage is an image that looks real but is not really there. This phenomenon is called an Optical Illusion.  Mirages are usually formed by layers of air at different temperatures and thicknesses close to a surface like the ground or a water body. ...

Sides of the Moon The moon has two main sides in relation to Earth. Near Side -  The near side of the moon is the side that faces Earth. We can observe this side and see various lunar features, such as craters and the dark-colored flat plains formed by volcanic...