Question

PLEASE HELP!

Fill in the blank.

Bubbles in glacial ice preserve samples of the ancient atmosphere as far back as ____ years ago, and the chemical composition of glacial ice contains information about ancient temperatures.
Question 1 options:


1 million


800,000


400,000


100,000

Answer 1

The answer should be 650,000 years

Step-by-step explanation:

The air bubbles are extracted by melting, crushing or grating the ice in a vacuum. This method provides detailed records of carbon dioxide, methane and nitrous oxide going back over 650,000 years[6].

Answer 2

800,00 im currently taking this quiz i hope its right

Step-by-step explanation: