Earth is a restless planet. Movements of huge, rocky plates under the surface can cause the ground to shake in eartquakes. Sometimes quakes are mild tremors, but often they are powerful and dangerous.
What secrets lie deep in the ocean, high up in the sky or way out in space? Look inside to discover the many, and sometimes dangerous, journeys we have taken into the unknown.
Insects may be tiny, but there are more insects on Earth than any other kind of animal. They can also survive in places that no other animal can. Insects may live alone or in groups containing millions.
The sun, wind and water all have powerful anergy that we use in our daily lives. Did you know that garbage has power that we now use? Where else do we get our energy?
Beneath Earth's surface is hot, liquid rock. This can squeeze up to the survace, where it erupts as a volcano. Lava spurts up from the volcano, while ash and gas form dense mushroom clouds above.
Skydivers jump out of planes and rock climbers climb on cliffs. Bungee jumpers fall from tall heights with strong cords to stop them hitting the ground. Look inside for more scary sports!
The ancient Chinese were the first to make silk. Chinese travellers took silk to other countries and traded it for other products. The route they followed is now know as the "Silk Road".
One-third of Earth's surface is covered by land. Most of this area is made up of huge land masses called continents. Islands occupy much less space. Water-oceans, lakes and rivers-covers the rest.
Mummies are preserved bodies. Egyptian mummies were buried. But some people's bodies became mummies by accident. Sometimes, the clothes they were wearing were also preserved!
Lizards belong to a group of animals called reptiles. There are all kinds: chameleons with sticky tounges that swat flies, marine iguanas that swim in the sea and basilisk lizards that run on water.