Question

The concept of the ocean floor or seafloor spreading was proposed by

• A. Alfred Wegener
• B. Antonio Pellegrini
• C. Brown Kennet
• D. Harry Hess

Hint:

Seafloor spreading describes how new oceanic crust is created at mid-ocean ridges and moves outward, carrying the continents with it.

Answer 1

The Correct Option is D

Step 1: Understand the concept.
Seafloor spreading means new ocean crust is born at the mid-ocean ridges and slowly moves sideways, pushing the plates apart.

Step 2: Recall who gave this idea.
This concept was put forward by the American geologist Harry Hess in the early 1960s.

Step 3: Note his reasoning.
Hess said hot molten material rises at the ridge, cools to form fresh crust, and then spreads outward on both sides.

Step 4: Eliminate the wrong names.
Wegener is linked to continental drift, not seafloor spreading, and Pellegrini and Brown Kennet are not the authors of this idea.

Step 5: Fix the correct person.
The clear credit for seafloor spreading goes to Harry Hess.

Step 6: State the answer.
So the concept of seafloor spreading was proposed by Harry Hess.
\[ \boxed{\text{Harry Hess}} \]