Ice Core Drilling
	q The best place on an ice sheet to take ice cores is at the top. q Ice cores can be dated by counting annually deposited layer (or ice flow model). q Annual layering is recorded in several properties of ice cores, the most obvious of which are layers of dust easily visible to the eye. q Dust is usually deposited at the end of cold, dry windy winters. q One of the most famous ice core drilling is at a site high on the Antarctic ice sheet, which is called the Vostok ice record.