Which of the following resources found in ocean sediments has the greatest economic value?
A) Gas hydrates
B) Manganese nodules and crusts
C) Petroleum
D) Rare-earth elements
E) Sand and gravel
Question 2
Which part of Earth's cumulative hypsographic curve includes linear scars in the ocean floor, caused by the collision of two plates along convergent plate margins?
A) The gentle slope above sea level
B) The long and flat part below sea level
C) The shallowest slope below sea level
D) The steep deepest part below sea level
E) The steep segment above sea level