Answer:
Scientists can drill deep into the ice to collect ice cores.
Step-by-step explanation:
Ice cores refers to cylinders of ice drilled from ice sheets and glaciers in Greenland, Antarctica as well as high mountain.
Ice cores are recovered from using drills which help to collect ice cores from ice.
This allow scientist to drill deep into the ice to collect ice cores to know past climates.
The layers in ice cores indicates to years and seasons.
The youngest ice is normally at the top , followed by the younger one and the the older ice is ways at the bottom.