Dinosaur Extinction

Q1: When did dinosaurs go extinct?

250 million years ago
100 million years ago
65 million years ago
They are still alive
Good answeres: 1

Q2: How do we call that extinction?

Cretaceous–Paleogene extinction event
Triassic–Jurassic extinction event
Late Devonian extinction
Ordovician–Silurian extinction events
Good answeres: 1

Q3: What was the main cause?

volcanic explosion
anoxia (reduction of oxygen levels in seas)
meteor impact
Changes in climate
Good answeres: 3

Q4: What species did mainly go extinct?

ancient shells
mammals
ammonites
dinosaurs
insects
Good answeres: 3

Q5: What percentage of species did remain?

5%
10%
25%
50%
Good answeres: 1

Q6: How many great extinctions happened during the existnce of dinosaurs?

1
2
3
4
Good answeres: 1

Q7: What species did remain?

large reptiles
mammals
crocodyliforms
birds
Good answeres: 2

Q8: How can we tell how they went extinct?

from fossils
from the sea
from the Earth's crust
from the chemicals in the ground
Good answeres: 2

Q9: What is the evidence for the meteor impact?

high conentration of iridium in fossils
high concentration of mercury in fossils
the position of the fossils
the reduction of sea levels
Good answeres: 1

Q10: Where is that evidence?

Labrador peninsula
Yucatan peninsula
in the middle of the Atlantic ocean
in the middle of the Pacific ocean
Good answeres: 1

Q11: Why did large amounts of large reptile species go extinct?

because they suffer the most from anoxia
because they got eaten
because most of them are herbivores and couldnt eat anything
because their cold blood couldn't handle the weather change
Good answeres: 1

Q12: In what era did dinosaurs live in?

Triassic
Jurassic
Paleozoic
Cretaceous
Good answeres: 3