Which of the following is true of the earth's land masses? (a) They were formed by earthquakes. (b) They are the upper part of the crust. (c) They are made of a single tectonic plate. (d) They are the densest part of the crust.

The answer is (B) “They are the upper part of the earths Crust” hope it helps :)

The study of where things are 

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!