A ________ is a geographic low, which marks the location where ...

[azncindy619]

A ________ is a geographic low, which marks the location where oceanic lithosphere descends into the mantle.
 
  A) fold and thrust mountain
  B) deep-ocean trench
  C) seismic zone
  D) mid-ocean rift

Question 2

In the mid-twentieth century, researchers dredging the seafloor could not find any materials older than ________.
 
  A) 10,000 years
  B) 1.2 million years
  C) 180 million years
  D) 1.5 billion years

[joneynes]

Answer to Question 1

Answer: B

Answer to Question 2

Answer: C

[azncindy619]

Excellent

[phuda]

Gracias!