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Science, :red, https://www.youtube.com/watch?v=i8hYuD9ukMQ, https://www…

- - - - Volcanoes: openings of the terrestrial cortex that reach deep zones where magma comes ut, as well as smoke, flames, right matter or melted matter
      - Earthquakes:They are sudden movements of the surface layers of the Earth produced by the fracture and displacement of large rock masses inside the crusts.
  - - - Water: It acts in different ways like the rain that wears the ground and pulls out small fragments that gush torrents, rivers, etc. The ice in glacial and peroglacial zones, the marine waters by the action of the alone is the abrasion and the subterranean waters that seep to the interior
      - Living beings; Normally the vegetation breaks the rocks with their roots and fixes the soil of the mountains, thus preventing it from being washed away by the rains. In addition, human activities change the landscape.
      - Wind: Drag small particles that when hitting the rocks wear them down.
- - - - Icnofossils. They are remains of food or organic activity fossilized in rock.
      - Eggs and nests. They are the strangest to find.
      - Coprolites. It is the excrement of a fossilized animal.
      - Gastrolitos: They are stones that certain aimals, especially birds ingest to aid digeston
      - Bones and teeth. They are the easiest fossils to find since the bone structure of the bone and the tooth allows their duration and the fossilization process in this type of piece.
- - - - video:https://www.youtube.com/watch?v=lUSr61zYy-8
- - - - When did the rocks form?
        The oldest dated rocks on Earth, as aggregates of minerals that have not subsequently disintegrated by erosion or fusion, are more than 4 billion years old and formed during the geological history of the Earth's Aeon Hadon.
      - https://www.youtube.com/watch?v=a3olYeNUVM0