Lich su Trai dat qua hinh anh..

PhanVien.Com . Bai Viet . Kien Thuc Khoa Hoc . Moi Truong Hoc . Lich su Trai dat qua hinh anh..

Lich su Trai dat qua hinh anh.

Trai dat la hanh tinh duoc hinh thanh cach day gan 4,6 ty nam va su song xuat hien tren be mat cua no khoang 1 ty nam truoc..

Lich su Trai dat qua hinh anh. - Ban co dau.
Lich su Trai dat qua hinh anh. - Ban khong dau.
Sponsored links:

Lich su Trai dat qua hinh anh..

Tu hinh thanh cach day khoang 4,6 ty nam, Trai dat cua chung ta da qua bao lan “vat doi sao doi” voi nhung buoc tien hoa quan trong.

I. Thoi so khai (4.6 ty – 570 trieu nam)

Hinh thanh trai dat

Trai dat cua chung ta duoc hinh thanh cach day khoang 4,5 ty nam truoc, song song voi qua trinh hinh thanh He mat troi. Luc nay He mat troi chi la mot dam may bui va khi rat lon, quay tron, goi la Tinh van Mat troi, duoc sinh ra tu vu no lon cach day khoang 13,7 ty nam.

Nhung khoi da dau tien (cach day 3,95 ty nam)

Cau truc da gia nhat tren trai dat chinh la lop vo dau tien cua trai dat duoc tao thanh do nham thach nong chay trao qua cac khe nut duoi day bien. Nhung cau truc da duoc phat hien o phia tay Greenland cho biet chung duoc hinh thanh tu cach day khoang 3,8 ti nam.

Nong do Oxy bat dau tang (2,3 ty nam)

Mot loai vi khuan don bao song o bien da tao ra oxy va lam cho khong khi tren trai dat bat dau co the hit tho duoc. Chung hap thu anh sang mat troi va thong qua qua trinh quang hop de san sinh ra oxy. Bat dau tu do, tang ozone dan hinh thanh, bao ve trai dat khoi nhung tia tu ngoai gay gat tu mat troi.

II. Thoi co dai (570 – 248 trieu nam)

a/ Ky Cambrian (570 – 500 trieu nam)

Dong vat than mem co vo cung xuat hien. Nhung hoa thach cua loai nay cho thay chung co mat tren trai dat tu 545 trieu nam truoc. Nguon goc va qua trinh tien hoa cua cua loai nay – la to tien cua cac loai trai, oc, muc, bach tuot – hien van chua ro.

Xuat hien dong vat co xuong song dau tien. Hoa thach co nhat cua dong vat co xuong song - la nhung loai ca khong co ham - duoc phat hien vao nhung nam 1990, cho thay chung co mat tren hanh tinh nay 530 trieu nam truoc.

b/ Ky ordovician (500- 435 trieu nam)

Nhung loai ca sun dau tien – la to tien cua cac loai ca map - da luon lo o cac dai duong cach day khoang 450 trieu nam. Goi la ca sun vi khung xuong cua chung duoc cau tao hoan toan bang sun.

c/ Ky Silurian (435 – 410 trieu nam)

Dong vat thuoc lop nhen xuat hien. Ngay nay chung ta biet rang cac loai thuoc nhom nay – bao gom nhen, bo cap, bet – deu song tren can; tuy nhien, to tien cua chung lai bat dau tu bien. Nguoi ta cho rang bo cap la loai co nhat trong nhom nay, co mat cach day khoang 430 trieu nam. Va vao thoi nay, kich thuoc cua chung cung rat lon, nguoi ta da phat hien hoa thach cua mot loai bo cap bien dai den 2,5m.

Cay coi bat dau dam re tren mat dat khoang 430 trieu nam truoc. De chuyen tu moi truong nuoc len sinh song tren can, cac loai thuc vat co xua da phat trien mot he thong mach dan trong than de dan nuoc va chat dinh duong, ngoai ra chung con phat trien mot bo khung cung giup chung co the dung thang tren mat dat.

d/ Ky Devonian (410 – 360 trieu nam)

Dong vat luong cu bat dau troi len khoi mat nuoc cach day khoang 370 trieu nam. Chung la nhung dong vat co xuong song dau tien buoc di tren mat dat, tien hoa tu 1 loai ca co kha nang hit tho khong khi.

e/ Ky Carboniferous (360 – 290 trieu nam)

Cac luc dia nho xich lai gan nhau, tao thanh 1 dai luc dia duy nhat la Pangaea.

Cac mo than da dan hinh thanh tu nhung than go muc o nhung khu rung dam lay tuoi tot sum xue tai cac vung duyen hai. Cac mo than da ngay nay duoc tim thay chu yeu o Bac My, Chau Au, va mot phan o Chau A.


Lop bo sat bat dau xuat hien. Nhung dong vat co nhat thuoc lop nay co mat cach day khoang 300 trieu nam.

f/ Ky Permian (290 – 248)

Dong vat lop bo sat phat trien thinh vuong nho vao moi truong song cua dai luc dia luc bay gio kha than thien va phu hop voi chung. Thich nghi voi khi hau kho nong, chung phat trien ca ve song luong lan kich thuoc.

Dot tuyet chung hang loat lon chua tung thay trong lich su trai dat. Khoang 95% sinh vat bien va 70% dong vat song tren can bi xoa so. Nguyen nhan chinh la do khi hau thay doi doi ngot va lien tuc, trai dat lien tuc nong len roi lai lanh dot ngot lam cho hau het sinh vat khong the thich ung kip.

III. Trung Dai (248 – 63 trieu nam)

a/ Ky Triassic (248 – 205 trieu nam)

Nhung loai khung long dau tien co mat tren hanh tinh khoang 240 trieu nam ve truoc. Trong so chung, co loai an co co kich thuoc chi bang mot con kangaroo, co loai an thit kich thuoc khoang 1m, va cung co nhung loai dang so voi chieu dai than minh den 6m.

Dai luc dia chia tach vao khoang cuoi ky Triassic. Chau Au tach khoi Chau Phi, Nam My roi khoi Trung va Bac My.

Thu nho co long thuoc lop dong vat co vu xuat hien, tiep noi sau su suy tan cua to tien chung la cac loai bo sat.

b/ Ky Jurassic (205 – 138 trieu nam)

Cac loai khung long thong tri mat dat.

Nhung loai chim dau tien bat dau tung canh khoang 150 trieu nam truoc. Cac hoa thach cho thay chung van con mot so dac diem cau tao cua loai bo sat nhu mot cai duoi xuong, canh co vuot, va rang nhon.

c/ Ky Cretaceous (138 – 63 trieu nam)

Nhung loai cay co hoa bat dau hien dien cach day khoang 125 trieu nam. Co le chung da manh mun xuat hien trong ky Jurassic nhung den ky nay moi bat dau no ro nho vao khi hau am ap va on hoa.

Su tuyet diet cua loai khung long xay ra khoang 65 trieu nam truoc, vao cuoi ky Cretaceous. Toan bo cac loai khung long khong co canh da bi quet sach. Vao dot tuyet chung hang loat lan nay, co khoang 50% dong thuc vat tren hanh tinh da bien mat. Va mot lan nua, nguyen nhan chinh la do bien doi khi hau.

IV. Dai tan sinh (bat dau tu cach day 63 trieu nam)

a/ Ky Paleogene (63 – 24 trieu nam)

Dong vat co vu the cho khung long, chung nhanh chong phan chia thanh nhieu loai va phat trien ca ve so luong lan kich thuoc co the.

Dong vat linh truong xuat hien khoang 55 trieu nam truoc. Chung co kich thuoc nho, than minh phu long va co kha nang di chuyen linh hoat tren cac canh cay. Chung cung co bo nao kha lon so voi kich thuoc than minh.

b/ Ky Neogene (24 – 2 trieu nam)

Nguoi co xuat hien khoang tu 6-8 trieu nam truoc voi buoc dot pha la bat dau di thang bang 2 chan. Ho khong con song tren cay nua ma chi treo cay de hai trai, tim hang dong de tranh thu du vao ban dem.

c/ Ky Quarternary (2 trieu nam)

Bang gia bat dau len loi khap cac ngo ngach tren trai dat. Trong khoang 1,8 trieu nam qua, trai dat da lien tuc bi cac dot bang gia bao phu, va dot cuoi cung ket thuc khoang 10.000 nam ve truoc. Trong nhung dot bang gia khac nghiet keo dai nay xuat hien nhung loai thu co long phu rat day, nhu loai voi mammoth.

Nguoi hien dai xuat hien o Chau Phi khoang 190.000 nam truoc. Nhung cuoc di dan dau tien ra khoi Chau Phi bat dau khoang 70.000 nam truoc, nguoi hien dai dan xam nhap den cac vung dat xa xoi nhu Chau Uc va Nam My.

Sponsored links:

Theo khoahoc.com.vn

Updated: 14/11/2010 | Views: 0 | Comments: 0

Read full: Lich su Trai dat qua hinh anh.

Post your comment about Lich su Trai dat qua hinh anh. go to this page.

Read more about Lich su Trai dat qua hinh anh.

Your comment will be displayed here Lich su Trai dat qua hinh anh.. Comment title Lich su Trai dat qua hinh anh. . Lich su Trai dat qua hinh anh. Kien Thuc Khoa Hoc in category Moi Truong Hoc.

Comments on Lich su Trai dat qua hinh anh.

Hien tai chua co binh luan nao ve bai viet Lich su Trai dat qua hinh anh.!

Ban co y kien gi ve bai viet Lich su Trai dat qua hinh anh. nay? Hay goi suy nghi, binh luan, danh gia, loi khuyen ... cua ban ve bai viet Lich su Trai dat qua hinh anh. ban tai day.

Tin Tuc Online - Bai Moi

Phan Vien
Ket noi voi nha phat trien ung dung phan mem Phan Vien tren Facebook!
Phanvien | Mobile Version | Contact Us | Terms of Use | Privacy Policy | Refresh
Copyright © 2006 - 2013 PhanVien.Com . All rights reserved.
Cached: IP: 115.79.90.196, 18 February, 2013 15:37:30 (GMT +7 HANOI - VIETNAM).