Question

directions: using your notes and online textbook, create a 1 paragraph explanation (2 chunks) showing evidence of seafloor spreading.

Explanation:

One chunk: Magnetic striping on the seafloor—rocks show alternating normal/reversed magnetic polarities, matching Earth’s magnetic reversal timeline, proving new crust forms at mid - ocean ridges. Second chunk: Age of seafloor rocks—youngest at ridges, older as distance from ridges increases, supporting new crust spreading outward from ridges.

Answer:

One chunk of evidence for seafloor spreading is magnetic striping: seafloor rocks have alternating bands of normal and reversed magnetic polarity that align with Earth’s magnetic reversal history, indicating new crust forms at mid - ocean ridges. Another chunk is the age of seafloor rocks: rocks are youngest at mid - ocean ridges and grow older with distance from the ridges, showing crust spreads outward from these ridges.