Question

Think about how the geologic time scale was created and how it is divided. Then answer the following questions.

How did scientists form the geologic time scale?
How is this scale organized?
What processes changed the Earth's environment during Precambrian time?

Please answer with a paragraph or a few sentences correctly.

Answer 1

Answer:

1)The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks

2)The divisions of the geologic time scale are organized stratigraphically, with the oldest at the bottom and youngest at the top.

3)New varieties began to harness the power of the sun through a biochemical process known as photosynthesis—a move that would ultimately lead to simple plants and which opened the planet up to animal life.

Or

During the pre-Cambrian period, three eons of pre-Cambrian time - a Hadean Eon-, the Archean Eon, and the Project Eon - changed the earth's surface.

The earth was an immense field filled with lava at the beginning of the Precambrian era, asteroids strikes were always found.

Since the suddenly the world's climate starts changing and the ocean is born, bringing life to the Earth.

Oxygen and plumes are beginning to develop, and the planet has become an excellent location to dwell on microorganisms

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Answer 2

How did scientists form the geologic time scale?

• The scientist formed the geological time scale by observing the fossils of the organisms that lived thousands of years ago.
• They also observed the sedimentary rocks.
• By observing they found the young and old fossils and based on that they divided the past into several time frames.

How is this scale organized?

• The time scale is organized into several time frames.
• They were named eons, eras, periods and epochs.
• The formal unit to measure the geological time is billion years.

What processes changed the Earth's environment during Precambrian time?

• The Precambrian time was the period when several changes were taking place like the crusts separated into continents, formation of ocean basins, changes in the earth’s atmosphere.
• As a result It saw the oxidation of the atmosphere, and with the availability of atmosphere organisms started to evolve.

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