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 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 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 Linh nè Nghiêm http://www.cadasa.vn/khoi-lop12/lich-su-hinh-thanh-va-phat-trien-lanh-tho.aspx