This is not a new phone app, but one new to me as I recently discovered it a couple of week's ago. NASA's Earth Now phone app is a wonderful app that gives you a TON of information on the Earth.
Earth Now Phone App
With a tap of the screen I have at my hands information on the current air temperature all over the Earth, carbon dioxide levels, ozone levels, sea levels, water vapor levels, etc. All of this is displayed in the form of a map on your phone screen. With a swipe left or right you can rotate the Earth and see how these levels change in different geographic areas. On top of that NASA provides facts on each of these. This is an amazing tool that is cool, yet very informative. Definitely check it out and download it to your device.