John is assisting a geologist who has traveled across the world and collected a few samples. he asks john to classify the samples that can be dated using carbon-14 and uranium-235 (or u-235). all organic materials contain carbon and are dated using c-14; inorganic materials are dated using any radioactive element, such as uranium, rubidium, potassium, and thorium, except carbon. now, john group the samples.

Humid continental climate is found in the interior of continents between the 30 and 60 degrees latitude, but usually above the 40 degree line.   40 degrees north of the equator means less direct sunlight and therefore less warmth.   this climate is mainly found in the northern hemisphere since there are no major landmasses in the southern hemisphere.  if you live in northern indiana, you know all about humid continental because that is the climate type you have!

Answer the collision of tectonic plates;

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