The method of scientific dating based on the analysis of tree-ring growth patterns. |
A core sample from the accumulation of snow and ice over many years that have re- crystallized and have trapped air bubbles from previous time periods. |
is the study of glaciers or more generally ice and natural phenomena that involve ice. |
The scientific study of landforms and the processes that shape them. |
Find the missing code:
L1#1O2~2, J2#2Q3~3, _______, F4#4U5~5, D5#5W6~6