The materials which the solid crust of Earth consists of are rocks. These components formed through magma-stiffening (primary rocks) or through magma erosion (sedimental) or changing (secondary rocks). The 90-95% of the solid crust is primary rock. 4% is metamorph rock, 1-2% sedimentary rock. There are rocks that are forming in front of our eyes on the Earth surface but most of them were created in the past of Earth within one of the geochronological eras through natural processes.
The geological map of Hungary:
1, Magmatic rocks: 1: granite (ancient), 2: andesite, riolite, basaltlava and tufa (from the tertiary period).
- 2, Transformed rocks: 3: fillite and gneis (from the beginning of the ancient period).
3, Sedimentary rocks: 4: carbon, lime and clay slate, 5: permi red sandstone and conglomerate, 6: trias lime, dolomit and marl, 7: jura-cretaceous lime and marl, 8 eocene, oligocene lime, marl, sandstone (mainly clay), 9: miocene clay and lime, 10: pliocene (pannon) material, sand and gravel, 11: pleistocene river gravel and sand, 12: pleistocene loess, 13: pleistocene adobe, 14: pleistocene sand, 15: ancient holocene futósand, 16: ancient holocene river sand, gravel and mud, 17: holocene turf, 18: holocene meadow clay, 19: neo-holocene moulding mud and moulding sand (alluvium)