What does "The Oldest and Youngest Places on Earth" suggest about the connection between the earth's mantle and both Baffin Island and Hunga Tonga-Hunga Ha'apai? The rock that formed and remains on both islands came from or through the mantle.

The stability of the mantle is what has prevented these islands from changing much over time.

The rock that formed both islands has now been absorbed back into the earth's mantle.

The mantle is what caused thriving ecosystems to emerge on both islands.