We sometimes call valuable metals, such as platinum and gold, precious metals. Platinum is the most valuable metal in …

How are Metals Formed? Everything on earth is made up of a combination of building blocks called the chemical elemen…

What is Ocean Mining? Deep down on the seabed, there are fist-sized lumps, or nodules, that contain lots of minera…

What is a climate? The weather where you live may be sunny one day and cloudy the next, or dry during one season a…

How to make a Hygrometer?  When you're planning a picnic with your friends, you need to know that the weather…

What is your weather like today? Is it sunny, cold, wet or dry? What causes these different kinds of weather? Heat and…

How do Rocks Change? Have you ever seen waves pounding against the coastline? The force of the water moves the sa…

The waters of an ocean are moving all the time. The surface of the water moves up and down as waves travel across th…

Nearly three-quarters of the earth's surface is covered by water. The land under the oceans is made up of mountai…

Take a close look at a small rock. Can you tiny pieces of different colors and apes in it? These pieces are called min…

On our planet, there are about 530 active volcanoes, which might erupt at any time. Some of them lie under the sea. …

Would you be frightened if the ground started shaking under your feet? Sudden, violent movements under the earth'…

Can you believe that the top of the world's tallest mountain was once at the bottom of the sea? Scientists disco…

Look at a map of the world. Can you see the shapes of Africa and South America? Does it look as if they will fit t…

Several layers of air surround our planet.  Together, these are known as the atmosphere.  The layer nearest to the …

How do we know what is inside the earth? Astronauts have traveled about 228,000 miles (380,000 kilometers) above the …

Pour a teaspoonful of salt into a glass of water. Now stir it and watch the salt slowly disappear from sight. It i…

When you pump up your bicycle tires or football, you are making use of compressed air. Inside a bicycle pump is a sma…

Blow up a balloon and then let it go. The force of the high-pressure air coming out of the neck makes the balloon ru…

Look out of your window. Is the air moving? It is probably moving enough to make the branches on the trees sway sli…

Look out of your window. Is the air moving? It is probably moving enough to make the branches on the trees sway sl…

What is an airfoil? When an airfoil moves through the air, it produces lift because the force of the air pushing dow…

How to Make a Pinwheel? You will need: a pencil a ruler a piece of thin cardboard, 4 in x 4 in (10 cm x 10 cm) a…

Do you realize that we live at the bottom of an ocean of gas?  This ocean of gas is called the atmosphere.  It is …

What is the Composition of Air? About one-fifth of the air is oxygen.     Human beings and other animals wou…

Have you ever wondered what everything in the world is made from?  The answer is matter. Matter is anything that t…

The world is changing around us all the time. There are physical changes as matter changes from solid to liquid t…

What are Tires Made out of? Think of all the different things that can be made from rubber. There are gloves, ru…

Have a look around you. How many things can you see made from plastics? In the modern world, different kinds of pl…

At the refinery, thousands of tons of oil are turned into useful substances every day. What is Crude Oil? Crude o…