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The laws of physics, or why all objects fall down?

What is plain?

What is the atmosphere and what it is for

As the Earth rotates around its axis and around the Sun.

What is a galaxy, and what are they?

You know, it looks like a finch?

Life above the head, or What is the Sun?

What is the natural community and its role in environmental protection

The highest mountain in Europe - debate continues

Amazing seahorses

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Biosphere - a basic definition ...
Who lives on the ocean floor?
How to protect ptarmigan nest?