Laika

| tiempos geológicos |
|Eón|Era |Período |Época |Intervalo |Duración |
| | || |(Millones de años) |(Millones de años) |
| | | || | |

Fanerozoico |Cenozoico |Cuaternario |Holoceno |  -   0.01 |     0.01 | | | | |Pleistoceno |   0.01   -  1.8 |    1.79 | | | |Terciario |Plioceno |   1.8 -   5 |     3.2 | | | | |Mioceno |   5 -  23 |    18 | | | | |Oligoceno |  23 -  37 |    14 | | | | |Eoceno |  37 -  55 |    18 | | | | |Paleoceno|  55 -  65 |    10 | | |Mesozoico |Cretácico |  65   - 140 |    75 | | | |Jurásico | 140   - 210 |    70 | | | |Triásico | 210   - 250 |    40 | | |Paleozoico |Pérmico | 250   - 290 |    40 | | ||Carbonífero | 290   - 360 |    70 | | | |Devónico | 360   - 410 |    50 | | | |Silúrico | 410   - 440 |    30 | | | |Ordovícico | 440   - 500 |    60 | | | |Cámbrico | 500   - 590 |    90 | |Precámbrico|Proterozoico |Superior |  590   - 900 |    310 | | | |Medio | 900   - 1600 |    700 | | | |Inferior | 1600   - 2500 |    900 | |[pic]

Continental drift theory[pic]

Inside the Earth

TheEarth is made of many different and distinct layers. The deeper layers are composed of heavier materials; they are hotter, denser and under much greater pressure than the outer layers.

Core: TheEarth has a iron-nickel core that is about 2,100 miles in radius. The inner core may have a temperature up to about 13,000°F (7,200°C = 7,500 K), which is hotter than the surface of the Sun. The...