Waves, ebbs and flows - description, photos and video...

Iron, steel, rust: description, photo and video...

The appearance of dinosaurs - description, photos and video...

The first giant mammals - description, photo and video...

Why is the sea polluted? Reasons, photos and videos...

Moving stones - description, photos and video...

Seafood - photos and video...

The simplest animals: description, photo and video...

The first winged dinosaurs - description, photos and video...

Insects in amber - how to get, description, photo and video...

How do plants deal with desert drought? Description, photo and video...

Ancestors of birds: description, photos and video...

How are lakes formed? Description, photo and video...

Reserves of drinking water on Earth: description, photo and video...

How many percent of the land occupied by settlements?...

Secrets of volcanoes - description and video...

What is the sky?...

Earth is expanding - the hypothesis of the expansion of the Earth - Where did the water come from?...

How are icebergs formed? Description, photo and video...

How the Earth’s circumference was first calculated - description, diagram, video...