Monteregian Hills The strange blue and white circles in the picture below are part of a group of unu
Monteregian HillsThe strange blue and white circles in the picture below are part of a group of unusual rock formations east of Montreal, Canada known as the Monteregian Hills. This astronaut photograph shows a striking contrast between the snow-covered hills made of igneous rock and the surrounding fertile agricultural land.The Monteregian hills are known as plutons in the geology world. A pluton is a mass of igneous rock formed from magma that has cooled below the surface. These particular plutons formed during the Cretaceous Period, roughly 125 million years ago. Over time, the sedimentary rock surrounding the plutons eroded away, leaving them exposed as hills on the surface.-AmyReference:http://visibleearth.nasa.gov/view.php?id=7719Photo credit NASA ISS Crew -- source link
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