1st PPT

Question 1

Earth was “born” about?

Answer 1

4.5BYBP

Question 2

What are the eras under precambrian?

Answer 2

Hadean Eon, Archaean Eon, Proterozoic Eon

Question 3

Planetary formation, intense volcanic activity.

Answer 3

Hadean Eon

Question 4

Early life forms, oxygenation of atmosphere.

Answer 4

Archaean Eon

Question 5

Oxygenation, multicellular life.

Answer 5

Proterozoic Eon

Question 6

Explosion of complex life.

Answer 6

Cambrian Period

Question 7

Diversification of marine life.

Answer 7

Ordovician Period

Question 8

Development of terrestrial ecosystems.

Answer 8

Silurian Period

Question 9

Fish and amphibian evolution.

Answer 9

Devonian Period

Question 10

Coal formation, amphibian dominance.

Answer 10

Carboniferous Period

Question 11

Massive extinction event.

Answer 11

Permian Period

Question 12

Periods under Paleozoic Era:

Answer 12

Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian

Question 13

Periods under Mesozoic Era:

Answer 13

Triassic, Jurassic, Cretaceous

Question 14

Early dinosaurs, recovery from extinction.

Answer 14

Triassic Period

Question 15

Dinosaur diversification.

Answer 15

Jurassic Period

Question 16

Flowering plants, final dinosaur dominance.

Answer 16

Cretaceous Period

Question 17

Periods under Cenozoic Era:

Answer 17

Paleogene, Neogene, Quaternary

Question 18

Mammalian evolution.

Answer 18

Paleogene Period

Question 19

Human evolution.

Answer 19

Neogene Period

Question 20

Modern human civilization.

Answer 20

Quaternary Period

Question 21

Major Mass Extinctions in Earth’s History

Answer 21

Ordovician-silurian, late devonian, end permian, triassic-jurassic, cretaceous-paleogene

Question 22

Species Loss: ~85%
Causes:
Glaciation
Sea-level changes
Possible gamma-ray burst

Answer 22

Ordovician-Silurian Extinction (~443-485 MYA)

Question 23

Species Loss: ~75%
Causes:
Ocean acidification
Sea-level changes
Climate shifts

Answer 23

Late Devonian Extinction (~375-360 MYA)

Question 24

Species Loss: ~96% (“The Great Dying”)
Causes:
Massive volcanic eruptions (Siberian Traps)
Climate change
Ocean acidification

Answer 24

End-Permian Extinction (~252 MYA)

Question 25

Species Loss: ~80% Causes: Volcanic activity Climate change Sea-level fluctuations

Answer 25

Triassic-Jurassic Extinction (~200 MYA)

Question 26

Species Loss: ~75% Causes: Asteroid impact Intense volcanic activity

Answer 26

Cretaceous-Paleogene Extinction (~65 MYA)

Question 27

Minor Extinctions in Earth’s History

Answer 27

Ediacaran, Middle Jurassic, Eocene-oligocene

Question 28

50% species loss.

Answer 28

Ediacaran Extinction

Question 29

20% species loss. 175 MYA

Answer 29

Middle Jurassic Extinction

Question 30

(~34 MYA): ~20% species loss.

Answer 30

Eocene-Oligocene Extinction

Question 31

Habitat destruction, Climate change, Pollution, Overexploitation, Invasive species

Answer 31

Holocene Extinction (~11,700 Years Ago to Present)

Question 32

Milestones in Earth’s Evolution

Answer 32

1. Oxygenation (~2.7 BYA) 2. Snowball Earth (~650 MYA) 3. Cambrian Explosion (~541 MYA) 4. Dinosaurs (~230-66 MYA) 5. Human Evolution (~6 million-50,000 years ago).