LESSON 3- HISTORY OF LIFE ON EARTH

1. What are the main hierarchical divisions of the geologic time scale?

• a) Eons, Eras, Periods, Epochs

• b) Ages, Periods, Epochs, Phases
  

• c) Eras, Periods, Epochs, Stages
  

• d) Eons, Ages, Periods, Eras

2. During which eon did the Late Heavy Bombardment occur?

• a) Archean

• b) Proterozoic
  

• c) Hadean
  

• d) Phanerozoic

4. What significant discovery has challenged previous views on the presence of Earth’s atmosphere and oceans3

• a) Fossilized stromatolites
  

• b) Ancient zircon grains
  

• c) Banded iron formations
  

• d) Ediacaran fauna

4.What mineral found in Australia dates back to around 4.4 billion years ago and provides evidence of early water and atmospheric conditions?

• a. quartz

• b. feldspar

• c. zircon

• d. calcite

5. Which eon saw the formation of Earth's first stable continental crust and oceans?

• a) Hadean
  

• b) Proterozoic
  

• c) Archean
  

• d) Phanerozoic

6.What was a key development during the Archean Eon that protected Earth's surface from harmful UV radiation?

• a) Formation of ozone layer

• b) Development of magnetic field
  

• c) Emergence of complex multicellular organisms
  

• d) Rise of atmospheric nitrogen

7. Which organism is primarily associated with the creation of stromatolites?

• a) Algae
  

• b) Cyanobacteria
  

• c) Diatoms
  

• d) Protozoa

8. The Ediacara fauna is significant because it represents the first appearance of what type of organisms?

• a) Single-celled organisms
  

• b) Multicellular organisms with complex body structures
  

• c) Dinosaurs
  

• d) Early plants

9. The Phanerozoic Eon is divided into which three eras?

• a) Paleozoic, Mesozoic, Cenozoic
  

• b) Archean, Proterozoic, Phanerozoic
  

• c) Cambrian, Silurian, Permian
  

• d) Mesozoic, Cenozoic, Neogene

10. Which extinction event at the end of the Mesozoic Era led to the demise of the non-avian dinosaurs?

• a) Permian-Triassic Extinction
  

• b) Triassic-Jurassic Extinction
  

• c) Cretaceous-Paleogene Extinction
  

• d) Devonian Extinction