Phạm Hồng Thái 22DH715213
Why dinos disappear?
1) QS is
Wh happened to dinos?
Why dinos disapp?
2) Not sure – 2 theories
1
st
: clim. change theory
2
nd
: asteroid theory
3) Climate theory
Over millions yrs – climate cooler
Plants died -> short of food -> no food 4 dinos -> become ext -> died
gradually and slowly over cent
4) Asteroid theory
Huge ast hit the earth ~ 65 mill yrs ago -> huge cloud of dust -> covered the
earth & blocked out the sun over months -> plants died -> food disappear
5) Late 20 centuries
Found large amounts of element called “iridium” – layer of earth ( 65 mill
yrs old) = bones of last dinos -> not common on earth & near surface -> a
lot in space => arrived when hit the earth 65 mill yrs ago
6) Asteroid theory explains 2 things:
Why large amount of elem iridium in 65 mill yrs old layer of earth
Food vanished -> dinos disappear
Still debate 2 theories -> will find out that dinos died out = disease in near
future.

Preview text:

Phạm Hồng Thái 22DH715213 Why dinos disappear? 1) QS is  Wh happened to dinos?  Why dinos disapp? 2) Not sure – 2 theories 1st: clim. change theory 2nd : asteroid theory 3) Climate theory
Over millions yrs – climate cooler
 Plants died -> short of food -> no food 4 dinos -> become ext -> died
gradually and slowly over cent 4) Asteroid theory
Huge ast hit the earth ~ 65 mill yrs ago -> huge cloud of dust -> covered the
earth & blocked out the sun over months -> plants died -> food disappear 5) Late 20 centuries
Found large amounts of element called “iridium” – layer of earth ( 65 mill
yrs old) = bones of last dinos -> not common on earth & near surface -> a
lot in space => arrived when hit the earth 65 mill yrs ago
6) Asteroid theory explains 2 things:
 Why large amount of elem iridium in 65 mill yrs old layer of earth
 Food vanished -> dinos disappear
 Still debate 2 theories -> will find out that dinos died out = disease in near future.