"I know everyone is in those final days before break, so it seemed fitting that there a TON of free apps to share today instead of waiting until Friday.
A few that I know for sure are time sensitive.. download ASAP!
"
What did Earth's continents and oceans look like 250 million years ago, or 1 billion years ago for that matter? Can we say anything about Earth's climate as far back as our planet's origin?