Ice that formed thousands of years ago is often found to contain tiny bubbles of gas. this gas came from view available hint(s) ice that formed thousands of years ago is often found to contain tiny bubbles of gas. this gas came from tiny phytoplankton that lived in the water before it froze the atmosphere water vapor released from melting ice tiny zooplankton that lived in the water before it froze

the atmosphere

Explanation:

When studying ice cores, we can sometimes encounter gases in them. These gases are often trapped in pockets of ice crystals.

Glaciers which are the origin of ice cores forms like sedimentary rocks. They undergo a lot of compression and compaction under their own weight. This leads to decrease in porosity and permeability between ice flakes. The prevalent atmosphere during their time of formation contributes gases that finds their way into pore spaces. These gases can collect into small pocket and survive the glaciation process.

These gases tells us about the atmospheric condition in the area the core was obtained.