B15.7 More about extinction Flashcards
1
Q
Why did Dinosaurs die?
A
Due to environmental changes they could not adapt to
2
Q
What is mass extinction?
A
When most of the species die over several millions years
3
Q
What are the main reasons for the dinosaur’s extinction?
A
Asteroid
Melting sea ice
4
Q
What is asteroid theory?
A
Found a huge crater 180km - found a mineral - iridium that is only formed when a rock is hit with a massive force such as an asteroid strike - impact caused huge fires and earthquakes - lots of materials blasted into the air causing a drop in temperature
5
Q
What is the melting ice theory?
A
Melting sea ice - caused by global warming flood seas and ocean with cold water - drop in sea temperature caused mass extinction - found unexpected change in fossils and minerals in areas of Norway
