Heat over ice
- Select a language for the TTS:
- UK English Female
- UK English Male
- US English Female
- US English Male
- Australian Female
- Australian Male
- Language selected: (auto detect) - EN
Play all audios:
The theory that polar regions once experienced summers while the tropics froze under ice has recently been challenged by Darren Williams of Pennsylvania State University in usa. According to
him, many organisms which survived this period would have died off if this had happened. Instead, Williams believes that the Earth's polar axis once tilted down towards the sun at an
angle 54 degrees or more. Polar regions would then have received more solar energy than the equator, and the glaciers could have grown in the tropics, while the poles would have stayed
ice-free.