Question

1. what is the main purpose of ice drilling?

a. to observe polar wildlife
b. to analyze past climate conditions
c. to track marine migration
d. to collect soil samples

Explanation:

Ice drilling is used to retrieve ice cores, which contain information about past climate (e.g., gas bubbles, isotopes). Option a is about wildlife observation, not ice drilling. Option c is marine migration tracking, unrelated. Option d is soil sampling, not ice - related. So the main purpose is analyzing past climate.

Answer:

b. To analyze past climate conditions