# Ice ages

For the last two and a half million years the planet has moved between long cold periods and warm ones, paced in part by slow changes in its orbit and tilt.

Connects to:
- [Orbits](https://mapideas.org/i/as_orbits)
- [Time as a cycle](https://mapideas.org/i/ti_cycles)

Sources:
- [Wikipedia: Ice age](https://en.wikipedia.org/wiki/Ice_age)
- [Wikipedia: Milankovitch cycles](https://en.wikipedia.org/wiki/Milankovitch_cycles)

Source: https://mapideas.org/i/ea_ice · open on the map: https://mapideas.org/#ea_ice