The winter layers are darker than the summer layers in the ice core because the summer snow is less tightly packed with particulate matter, therefore, it is brighter while the winter snow is more tightly packed due to the compaction and therefore it is darker.
What do you mean by Ice core?
Ice core may be defined as a structure of ice in a cylindrical shape which are plugged from the ice sheets or glaciers.
In winter, the snow that falls on the earth's surface is mixed with the more particulate matter due to compaction and hence it looks more darker as compared to summer snow.
Therefore, it is well described above.
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