Read each question carefully then identify the word being described.
1. I am the time when the earth become warm and started to have oxygen in the
atmosphere. What am I?
______________________________________________________________
2. I am the calendar of the Earth’s history. What am?
______________________________________________________________
3. I am the era that is also called as the Age of reptiles. What am I?
______________________________________________________________
4. I represent the longest span of time. What am I?
______________________________________________________________
5. I am the era of the “recent life”. What am I?
______________________________________________________________
1. I am the time when the earth become warm and started to have oxygen in the
atmosphere. What am I?
______________________________________________________________
2. I am the calendar of the Earth’s history. What am?
______________________________________________________________
3. I am the era that is also called as the Age of reptiles. What am I?
______________________________________________________________
4. I represent the longest span of time. What am I?
______________________________________________________________
5. I am the era of the “recent life”. What am I?
______________________________________________________________
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ANSWER:
1. Carbon Dioxide
Three and a half billion years ago, Earth's atmosphere contained almost no free oxygen. Instead, it consisted mainly of carbon dioxide, perhaps as much as 100 times more carbon dioxide than contained in today's atmosphere.
2. Geologic Time Scale
The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
3. Mesozoic
During the Mesozoic, or "Middle Life" era, life diversified rapidly and giant reptiles, dinosaurs and other monstrous beasts roamed the Earth. The period, which spans from about 252 million years ago to about 66 million years ago, was also known as the age of reptiles or the age of dinosaurs.
4. Precambrian Era
The longest span of time measured on the geologic time scale is the Precambrian Era (also called the Precambrian Eon). It represents the time between 4.55 billion years to about 544 million years ago, or about seven-eighths of the Earth's history.
5.Cenozoic Era
Cenozoic Era: The Age of Mammals
Cenozoic Era: The Age of MammalsThe word Cenozoic means “recent life.” The Cenozoic Era began 65 million years ago and continues to the present.