Question 1

Which method is most commonly used to determine the absolute age of rocks and fossils that are millions of years old?

Accepted Answer

Radiometric dating using uranium-lead methods

Question 2

In the calendar metaphor for Earth's history, if the entire 4.6 billion years is represented as one year, approximately how many million years does one 'month' represent?

Accepted Answer

$$400$$ million years

Question 3

What major biological event is associated with the Archaean Eon?

Accepted Answer

The origin of life and the beginning of atmospheric oxygen

Question 4

Which eon saw the origin of eukaryotic cells and multicellular life?

Accepted Answer

Proterozoic

Question 5

What is the most convincing explanation for the Cambrian Explosion?

Accepted Answer

A substantial increase in oxygen levels

Question 6

Which of the following is a consequence of continental drift?

Accepted Answer

Opening up new habitats and leading to speciation

Question 7

The Permian mass extinction is most closely associated with which environmental change?

Accepted Answer

Massive global warming due to volcanic activity releasing $$CO_2$$ and $$CH_4$$

Question 8

Which event marks the boundary between the Mesozoic and Cenozoic eras?

Accepted Answer

The Cretaceous mass extinction

Question 9

Radiometric dating requires knowledge of which two key factors?

Accepted Answer

The amount of parent and daughter isotopes and the half-life of the isotope

Question 10

Which of the following best describes adaptive radiation following a mass extinction?

Accepted Answer

Rapid diversification of surviving species to fill ecological niches

Question 11

Which process is responsible for the movement of continents over geological time?

Accepted Answer

Plate tectonics

Question 12

What evidence supports the theory of continental drift?

Accepted Answer

Similarity of fossils in South America and Africa

Question 13

Which group of animals evolved from lobe-finned fishes and are characterized by having four limbs?

Accepted Answer

Tetrapods

Question 14

Why is carbon dating not suitable for dating rocks and fossils millions of years old?

Accepted Answer

The half-life of carbon-14 is too short for such old samples

Question 15

Which of the following events is most closely linked to the first evidence of predator-prey interactions in the fossil record?

Accepted Answer

The Cambrian Explosion

Question 16

What is the primary cause of the Cretaceous mass extinction?

Accepted Answer

Meteorite impact causing dust clouds and global cooling

Question 17

Which of the following is NOT a direct effect of continental drift?

Accepted Answer

Immediate increase in atmospheric oxygen

Question 18

During which eon did most complex animal life (such as trilobites and dinosaurs) exist?

Accepted Answer

Phanerozoic

Question 19

Which of the following best explains why mass extinctions can lead to increased diversity of life?

Accepted Answer

By eliminating many species, new ecological niches become available for surviving species to diversify

Question 20

If a radioactive isotope has a half-life of $$1$$ million years, how much of the original parent isotope remains after $$3$$ million years?

Accepted Answer

$$\frac{1}{8} of $$the original amount

The History of Life on Earth: Geologic Time, Fossils, and Mass Extinctions

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