What type of evidence supports the existence of liquid surface water 4.4 billion years ago?
A)oxygen isotopic composition of zircons
B)radiometric dating of zircons
C)chemical composition of the Acasta gneiss
D)the age of the Acasta gneiss

Question

Quizplus · Accepted Answer

The oxygen isotopic composition of zircons has been used to infer the presence of liquid water on Earth's surface as early as 4.4 billion years ago. This is because the specific isotopes of oxygen within these zircons suggest they formed in the presence of water, indicating that liquid water was present on the Earth's surface at the time of their formation.

What Type of Evidence Supports the Existence of Liquid Surface