http://www.kumc.edu/SAH/OTEd/jradel/Poster_Presentations/PstrStart.html
The link above is a good source to go through step by step process of what is useful to be included onto poster presentations and what is not needed. Right from the start it gives a basic layout of a poster idea, and the reading is small and easy to navigate through and with good visuals to see rather than just read or hear another person say this is good and this is bad. It actually gives good visuals to either base ideas off of or to just use in bits and pieces as someone would do their own project.
abacus.bates.edu/~bpfohl/posters/
I really think this second link is useful specifically to us, because it caters to the use of PowerPoint in making a poster presentation. It gives little details that are helpful to make a poster look professional and to make it look as though there were actually time put into the project.
Wednesday, March 19, 2014
What causes Ice Ages?
It seems from the readings that ice ages are caused by many things, including Carbon dioxide and methane concentrations, changes in the Earth's orbit around the sun (Milankovitch Cycyles), and the motion of tectonic plates resulting in the relative location and the amount of continental and oceanic crust on the Earth's surface. Most of the issues begin with the idea that the Milankovitch cycle creates a period, in the North, that causes snow to not melt in the summer time from previous seasons. This is caused from lower than needed temperatures and as this cooling happens snow accumulates and keeps continuing up until it reaches areas that are warm enough for it to melt. As the snow is unable to melt it causes Carbon dioxide levels and temperature to decrease causing a period in which the cold only exist, from not enough heat getting trapped and instead reflected by the snow and becomes huge ice sheets that cover a mast amount of the Northern continents. There are of course other influences, such as winds taking water vapor to lower latitudes and ocean currents taking warmer water lower as well, but the main ideas behind the cause of an ice age are the period listed above.
Figure 1: This shows how ice ages can occur,more specifically the Milankovitch cycle. The Earth axis tilt over time and at points when the North or south is as far away as possible there comes the point when temperatures fail to reach a critical value to melt the ice and snow.
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