And the period (as it is now known, since the realisation that Earth is far older than the 6,000 ... Trilobites would not have been tasty. All shell and legs Back to Pangaea.

For humans, the gestation period can last forty weeks. There are cramps, morning sickness, strange food cravings, increasing discomfort, and a multitude of other effects. And the nine months of ...

So where did all the rock that belongs in between these time periods go? Using multiple lines of evidence, an international team of geoscientists reckons that the thief was Snowball Earth ...

During this period, the parts of the Earth classified as drylands expanded ... broad swaths of southern Africa and all of the Mediterranean. “Unlike droughts—temporary periods of low rainfall ...