My Honey Bear Book Of Rhymes 在線電子書 pdf 下載 txt下載 epub 下載 mobi 下載 2024


My Honey Bear Book Of Rhymes

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Dorothy Taylor 作者
譯者
1980-1 出版日期
57 頁數
0.00 價格
叢書系列
9780874490268 圖書編碼

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My Honey Bear Book Of Rhymes 在線電子書 epub 下載 mobi 下載 pdf 下載 txt 下載 2024

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My Honey Bear Book Of Rhymes 在線電子書 pdf 下載 txt下載 epub 下載 mobi 在線電子書下載

My Honey Bear Book Of Rhymes 在線電子書 圖書描述

It is easier to talk about the passing of millions of years than it is to

imagine how vast these long spans of time really are. In order to see how the

various ages of the Earth compare with each other, scientists who study

rocks and fossils, called geologists, sometimes use what is called a geological

clock.

This is how a geological clock is drawn up:

The Earth is thought to have existed for about forty five hundred million

years. If you imagine that huge length of time to be just one hour on a clock,

then all forms of life have existed for only fifteen to twenty minutes of that

hour; sea creatures for about eight minutes; land animals for less than five

minutes; mammals have spent a mere two and a half minutes on the Earth

and man and his ancestors, only about one second. To bring history, as

written by man, into this diagram would be very difficult. By this clock,

William the Conqueror invaded England less than one thousandth of a

second ago!

In order to make the dating of fossils easier, the earliest geologists divided

up the time since the Earth was formed. They first divided the time since the

Earth formed into five eras. The Azoic era was without life; the Proterozoic

era contained the very earliest forms of life; the Palaeozoic was the era in

which many sea creatures, fish and amphibians appeared; tlke reptiles ruled

the Mesozoic era and the Cenozoic era belonged to mamma~and to man. We

are, at present, in the Cenozoic era. Each era was divided into periods, as

shown in the diagram. There are further subdivisions of the periods, but not

everybody uses the same system of divisions.

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