How did the continental islands of Oceania form over time?
A
Portions of continents were separated due to tectonic plates moving, coupled with rising sea levels.B
Active volcanoes formed over fault lines on top of mountains and shot lava into the sea, forming islands.C
Coral reefs grew along the ocean floor, gathering sediment and creating land that lies very close to sea level.D
Magma slowly bubbled up from beneath the ocean, creating volcanic land that became islands.