Statistics: Posted by Slith — Tue Sep 02, 2014 1:31 am
Statistics: Posted by Rkobilan — Tue Sep 02, 2014 1:28 am
Statistics: Posted by monica44 — Tue Sep 02, 2014 12:43 am
Statistics: Posted by Kinninigan — Tue Sep 02, 2014 12:08 am
Statistics: Posted by Kinninigan — Mon Sep 01, 2014 11:58 pm
Statistics: Posted by Slith — Mon Sep 01, 2014 11:40 pm
Statistics: Posted by monica44 — Mon Sep 01, 2014 7:05 pm
Mega droughts and extreme floods
These are based on what happens if climate change is allowed to continue
It’s not something that’s ever happened in human history so it’s not something we think about too often, but Earth’s magnetic poles flip on a regular basis—at least, a regular basis on a geologic scale. And every time the poles flip, the magnetic field that shields our planet from deadly cosmic rays also flips. The next flip, according to new data collected by the European Space Agency, is coming up sooner than scientists expected.
Earth's magnetic field is rooted deep inside the planet. The solid inner core, which is about two-thirds the size of the Moon, is made primarily of iron and is super-heated to almost 10,300 degrees Fahrenheit. Surrounding this solid core is a thick layer made up of iron, nickel, and small amounts of other metals in a liquid state. Differences in temperature, pressure, and the composition of the outer, liquid core causes convection, and as these metals flow, they generate electric currents that in turn produce magnetic fields. Because the Earth is spinning on its axis, these magnetic fields align to form one giant magnetic field that envelops the planet.
Statistics: Posted by Chronicnerd — Mon Sep 01, 2014 6:24 pm
Statistics: Posted by Giovanni — Mon Sep 01, 2014 10:34 am