Địa 12 Bài 45 in English

Presentation of
geography
Menbers:
Light(Quang)
F**k(Thong)
Dragon(Long)
Multiplication(Nhan )
Complete (Thien)
Serious(Nghiem)
Consistently(Kien)
Valak(Khoa)


The history of Vietnamese territory is closely related
to the formation of the Earth.
There are 3 main stages:
-Stage pre-cambri
-Stage Co Kien Tao
-Stage Tan Kien Tao


Stage pre-cambri
• a. Time: This is the oldest, most prolonged period in the history of
development of Vietnam, begun 2 billion years ago, ending 540
million years ago.
• b. Only in a narrow area on our territory today: ancient platforms
such as arches of Chay river, Hoang Lien Son, Ma river, Kon Tum
block ....
• c. Natural ingredients are very primitive
- Atmosphere is very thin, almost no oxygen, only ammonia gas,
carbon dioxide, nitrogen, hydrogen.

- Waterborne: almost no surface water.
- Poor organisms: algae (green algae, red algae), molluscs
(jellyfish, sea anemones, sea anemones, snails, snails).


Stage Co Kien Tao
• a. Time: Expected in length to 477 million: Từ kỷ Cambri -542
triệu năm đến Kreta -65 million.
• b. This is the most volatile period in our country's natural history
Many areas are submerged in sea water and elevated through
the movement of paint: Caledoni, Hecxini, Indoxini and Kimeri.
Strong folding areas: Cham river archipelago, Viet Bac upriver,
Kon Tum geomorphology, Northwest ...
- Areas of fault, earthquake, strong eruption, forming rocks:
granite, andezite, minerals ...
c. The landscape of tropical geography in our country has been
very developed.


Stage Tan Kien Tao
•

•

This is the last stage in the history of the formation and development of the Vietnamese
territory, which continues to this day.

a. Time: This is the shortest period in the history of natural formation and development of
our country.
• b. Strongly affected by the cyclical movement of the Alps - Himalayas and the global climate

change:
- Advocate Hymalaya => folding, faulting, magmatic eruption, sedimentation, forming
exotic mineral deposits ...
c. It is a period of continuous improvement of the natural conditions that make our country look
and feel like today:
- Raise the terrain => young and active river, ancient hills are raised and expanded.
- Form plateau + delta
- Expanding the East Sea to create oil and gas tanks.
- Evolutionary biologists - human beings appear.
- The humid tropical nature has been shown clearly.


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