The oldest rocks and minerals on Earth's surface have been found in Canada and Australia and are from the:

A) Precambrian Era
B) Paleozoic Era
C) Mesozoic Era
D) Cenozoic Era

Precambrian Era

The Precambrian Era encompasses all of geological time prior to the Cambrian Period, covering approximately 88% of Earth's history and marked by the formation of the Earth and the appearance of early life.

Oldest Rocks

The earliest-formed rocks on Earth or within a specific geological setting, often found in the deepest layers of the Earth's crust.