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10-Apr-2020 05:21

These unconformities contain pollen from seed-bearing shrubs and trees, which indicates there were periods when the reef surface was above sea level (and so no coral growth at the surface) which lasted long enough for land plants to colonize the surface.

With this information we are ready to calculate the age of the Eniwetok reef.

The most reasonable explanation for coral growth begins with a volcano.

Volcanoes can build themselves thousands of feet upward from the ocean floor, and some of them will grow tall enough to break through the surface of the water.

The corals contain green algae in their interiors that provide oxygen the corals need to live.During periods of volcanic inactivity, corals and lime-secreting algae colonize the areas just below the shoreline around the volcano.The corals and algae cement themselves together with lime as they grow, thereby constructing a circular reef around the volcano. Further, as a result of tectonic activity, the volcano slowly sinks into the ocean depths.Using this value, the age of the reef is calculated by dividing 4,610 feet by 8 millimeters (about .3 inch) per year, which is about 175,000 years.But this is a minimum age since we have not taken into account the time periods (represented by the unconformities mentioned above) when the reef was not growing.

The corals contain green algae in their interiors that provide oxygen the corals need to live.

During periods of volcanic inactivity, corals and lime-secreting algae colonize the areas just below the shoreline around the volcano.

The corals and algae cement themselves together with lime as they grow, thereby constructing a circular reef around the volcano. Further, as a result of tectonic activity, the volcano slowly sinks into the ocean depths.

Using this value, the age of the reef is calculated by dividing 4,610 feet by 8 millimeters (about .3 inch) per year, which is about 175,000 years.

But this is a minimum age since we have not taken into account the time periods (represented by the unconformities mentioned above) when the reef was not growing.

They have a shallow lagoon in the middle and the open ocean lies toward the outside.