What two pieces of information would researchers need to have in ...

[viki]

What two pieces of information would researchers need to have in order to calculate the rate of plate motion for seafloor spreading?
 
  A) Age of the continent and depth of the water
  B) Distance from the rift and age of seafloor sample
  C) Age of the seafloor sample and age of the continent
  D) Type of rock and distance from the rift

Question 2

Samples from the seafloor around the Mid-Atlantic Ridge and the East Pacific Rise show that both areas have been creating new material in the last five million years.
 
  Samples from the East Pacific Rise show the five-million-year-old seafloor is three times as wide as similarly aged material from the Mid-Atlantic Ridge. What does this say about the rate of seafloor spreading in the East Pacific?
  A) The seafloor at both sites is growing at the same rate.
  B) The seafloor at the East Pacific Rise is growing more slowly.
  C) The seafloor at the Mid-Atlantic is growing more quickly.
  D) The seafloor at the Mid-Atlantic is growing more slowly.

[daiying98]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: D

[viki]

Excellent

[xiazhe]

Gracias!