How fast was the Pacific plate moving from 7.2 million years ago to 4.7 million

Question

How fast was the Pacific plate moving from 7.2 million years ago to 4.7 million years ago between the formation of Kauai and Nihoa in cm/year? To calculate this divide the distance (in centimeters) between the two islands by the difference in their ages.

6. Given that this portion of the Australian plate moves at a speed of 2.2 inches per year, how old are the snake fossils?

Question 6 options:

310 million years old

217 million years old

98 million years old

62 million years old

34 million years old

7. There are fossils such as Glossopteris and Lystrosaurus that are found in rocks in South America and Africa that indicate they were part of Pangaea approximately 200 million years ago. These same fossils can be found in Australia, which indicates it, along with Antarctica, was also part of Pangaea at that time. Based on your answer to question 6 which of the following statements about the break-up of Pangaea is TRUE?

Question 7 options:

Australia and Antarctica separated before the break-up of Pangaea.

Australia and Antarctica separated during the break-up of Pangaea.

Australia and Antarctica separated after the break-up of Pangaea.

a)

310 million years old

b)

217 million years old

c)

98 million years old

d)

62 million years old

e)

34 million years old

Explanation / Answer

Distance between Kauai and Nihoa = 42.8 miles = 6887992 cm

Differnce in ages of the two islands = 7.2 - 4.7 million years = 2.5 million years = 2500000 years

Rate of movement= 6887992 / 2500000 cm/year = 2.755 cm/year

7. (c) Australia and Antarctica separated after the break-up of Pangea.

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