Hadean and Archean Eon

What is an eon?

•  Long span of geologic time. In formal usage, the longest portions of geologic time.

• very long span of geologic time; in formal usage, the second longest portions of geological time.

• the basic unit of the geologic time scale; during these spans of time specific systems of rocks were formed.

• Unit of geological time during which a rock series is deposited.

What is an era?

•  Long span of geologic time. In formal usage, the longest portions of geologic time.

• very long span of geologic time; in formal usage, the second longest portions of geological time.

• the basic unit of the geologic time scale; during these spans of time specific systems of rocks were formed.

• Unit of geological time during which a rock series is deposited.

What is an period?

•  Long span of geologic time. In formal usage, the longest portions of geologic time.

• very long span of geologic time; in formal usage, the second longest portions of geological time.

• the basic unit of the geologic time scale; during these spans of time specific systems of rocks were formed.

• Unit of geological time during which a rock series is deposited.

Which of the following eons is not a Precambrian eon?

• Proterozoic

• Hadean

• Phanerozoic

• Archean

When did the formation of the moon occur?

• Hadean

• Archean

When did the formation of the earth occur?

• Hadean

• Archean

When did the late heavy bombardment occur?

• Hadean

• Archean

When was the first ocean formed?

• Hadean

• Archean

When was the cyannobacteria formed?

• Hadean

• Archean

When did the DNA appear?

• Hadean

• Archean