
-The first buildings were the CAVES: natural underground voids large enough for a human to enter and formed by geologic processes.They are usually made of rock.
There, we can find a lot of information of the ancient civilitations by some paintings in their walls.

- Then, humans started to build houses by their own. SHACKS: they are small houses usually made with wood.
- Then people started building houses with other materials, such as bricks of cement, stone, iron, glass...
They were safer and more confortable than the old ones.
- Finally, humans started to built higher and more modern buildings, for example, the SKYSCRAPERS: tall, continuously habitable buildings.Modern skyscrapers are built with materials such as steel, glass, reinforced concrete and granite, and routinely utilize mechanical equipment such as water pumps and elevators.

Here we have a video with the tallest buildings nowadays.

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