How do scientists use ice to study ancient climates?

through glacial deposits and ice cores

through glacial deposits and ice ages

through ice cores and pollen grains

through pollen grains and ice ages

The scientists use ice to study ancient climates through ice cores and pollen grains.

Explanation:

The thin cores of ice are bored in the ice sheets and stored in specialized freezing rooms for studies. Each year's snow is compressed under the samples of the following years forming glacier ice.

The light bands mean that the snow is fresh due to the moisture that occurs in warm weather. On the other hand, dark bands refer to winter when the snow is mixed with the dust due to the wind, leading to the change in color of the white snow.