The oldest, most geologically stable parts of the Earth are the central cores of some continents (such as Australia, southern parts of Africa, and northern North America) where little mountain-building, faulting, or other tectonic processes have occurred for hundreds of millions to billions of years.
(The oldest, most geologically stable parts of the Earth; are; the central cores of some continents (such as Australia, southern parts of Africa, and northern North America) (little mountain-building, faulting, or other tectonic processes; have occurred; T:for hundreds of millions; L:Australia, southern parts of Africa, and northern North America)
The oldest, most geologically stable parts of the Earth little mountain-building, faulting, or other tectonic processes
are have occurred
the central cores of some continents (such as Australia, southern parts of Africa, and northern North America
T:for hundreds of millions L:Australia, southern parts of Africa, and northern North America