Earth is about 4.5 billion years old. In order to characterize the events that happened in this very long time scale, scientists have developed the geologic time scale. Here, the ages of the Earth is divided into (1)______________, which is turn are dived into (2)_____________, and are further subdivided into (3) _____________ The geologic time scale is so-called since the different subdivisions are based on the fossil record. During the (4)_____________, times, Earth’s biota were believed to be relatively simple, slow-metabolizing life. However, suddenly during the (5) )_____________, period, there was a large proliferation of fossils showing the increase in diversity of life. Scientist think that rising (6) _______________, levels caused the diversification event. Then eon comprising the Cambrian period up to the present is called the (7)_____________, eon. It is divided into three ears: Paleozoic, Mesozoic, and Cenozoic. In the Paleozoic ear, first (8)______________, appeared. The Mesozoic era is popularly known as the age where (9)______________, and other reptiles dominated the Earth. Finally, the Cenozoic er is where (10)_____________, flourished, lasting up to this day. The end of many eras and periods in the geologic time scale are characterized by (11)_____________. These events are triggered by different causes, but all are observed by the disappearance of (12)_____________ species in the succeeding rock strata
Earth is about 4.5 billion years old. In order to characterize the events that happened in this very long time scale, scientists have developed the geologic time scale. Here, the ages of the Earth is divided into (1)______________, which is turn are dived into (2)_____________, and are further subdivided into (3) _____________ The geologic time scale is so-called since the different subdivisions are based on the fossil record.
During the (4)_____________, times, Earth’s biota were believed to be relatively simple, slow-
Then eon comprising the Cambrian period up to the present is called the (7)_____________, eon. It is divided into three ears: Paleozoic, Mesozoic, and Cenozoic. In the Paleozoic ear, first (8)______________, appeared. The Mesozoic era is popularly known as the age where (9)______________, and other reptiles dominated the Earth. Finally, the Cenozoic er is where (10)_____________, flourished, lasting up to this day.
The end of many eras and periods in the geologic time scale are characterized by (11)_____________. These events are triggered by different causes, but all are observed by the disappearance of (12)_____________ species in the succeeding rock strata.
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