Our luscious blue Earth used to be a frozen snowball
More than 700 million years ago, our planet would have been unlivable due to an extreme ice age, and Australian geologists have a suggestion as to how this could have happened.
TroibNews 
More than 700 million years ago, our planet would have been unlivable due to an extreme ice age, and Australian geologists have a suggestion as to how this could have happened.
