# How old is Earth? When did life arise? On what is that estimate based? How did the moon form?

### Oceanography: An Invitation To Mar...

9th Edition
Garrison + 1 other
Publisher: Brooks Cole
ISBN: 9781305254282

### Oceanography: An Invitation To Mar...

9th Edition
Garrison + 1 other
Publisher: Brooks Cole
ISBN: 9781305254282

#### Solutions

Chapter
Section
Chapter 1, Problem 9TC
Textbook Problem

## How old is Earth? When did life arise? On what is that estimate based? How did the moon form?

Expert Solution
To determine

The age of the Earth, the time during which life originated, the base for these estimates, and the formation of Moon.

### Explanation of Solution

Age of the Earth and the time of origin of life

The earliest surface of Earth is assumed to have developed before nearly 4.6 billion years. Hence, its age is also taken as 4.6 billion years. There is no reliable evidence to prove that the age of Earth is between 6,000 and 10,000 years.

The scientists relied on many elements to arrive at a conclusion regarding the Earth’s age. The meteorites, rock chunks as well as metals formed during the same time of formation of the Sun and planets, out of the same cloud serve as one of the sources to estimate Earth’s age. A number of these objects have fallen to Earth recently. The signs of radiation inside these objects helps to determine their age. This information, together with the rate of radioactive decay of unstable atoms in meteorites, moon rocks, and in the most ancient rocks on Earth, lets the astronomers make sensibly precise approximations of the age of these objects.

The remnants of fairly intricate organisms resembling bacteria have been found from northwestern Australia, which dated between 3.4 billion and 3.5 billion years. This was the oldest fossils reported until now...

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