QUESTION 6 The great oxygenation event, which occurred around 2.5 Ga, marks the

Question

QUESTION 6

The great oxygenation event, which occurred around 2.5 Ga,

marks the appearance of the first organisms capable of photosynthesis

is when oxygen first appeared on Earth

is when oxygen began to accumulate in the atmosphere

marks when the oceans became oxidizing environments

both c. and d.

QUESTION 7

The rapid diversification of life around 541 Ma, after the snowball Earth extinction event, is called:

the Cambrian explosion

the Great Diversification

the Age of Reptiles

the Anthropocene

Taconic orogeny

QUESTION 8

Which of the following is NOT a line of evidence that led geologists to propose that a meteor impact caused the K-T extinction?

tsunami deposits

high concentrations of iridium in sediments

a large crater on the coast of the Yucatan

glassy spherules

"thick, worldwide glacial deposits"

QUESTION 9

Which of the following is NOT correct?

The Cenozoic is considered the Age of Mammals.

The K-T extinction was the largest extinction event in Earth s history.

Plants colonized land before animals.

Swimming reptiles were abundant in the Mesozoic.

The Appalachian Mountains were formed by several orogenies throughout the Paleozoic.

marks the appearance of the first organisms capable of photosynthesis

is when oxygen first appeared on Earth

is when oxygen began to accumulate in the atmosphere

marks when the oceans became oxidizing environments

both c. and d.

Explanation / Answer

Q.6. The great oxygenation event, which occurred around 2.5 Ga, is when oxygen began to accumulate in the atmosphere. Because this is the time when there is the appearance of dioxygen (O2) in in the Earths atmosphere. It is believed that in this time oxygen was produced by photosynthesis.

And this time also marks when the oceans became oxidizing environments. Because BIF (Banded Iron Formation) is mainly formed in this time period (2.0-2.5 Ga) worldwide. Oxidizing environment must be needed for this type of rock formation and this rock was mainly formed in oceans.

So ans. is both C and D.

Q.7. The rapid diversification of life around 541 Ma, after the snowball Earth extinction event, is called the Cambrian Explosion.

Q.8. Which of the following is NOT a line of evidence that led geologists to propose that a meteor impact caused the K-T extinction?

Ans. Thick worldwide glacial deposits.

Q.9. Which of the following is NOT correct?

Ans. The K-T extinction was the largest extinction event in Earth s history. This is not Correct. Because largest extinction event was the P-T extinction. About 90-96% of all species became extinct.

All other options are correct.

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