Question

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

Explanation:

Seafloor spreading is supported by multiple lines of evidence. First, magnetic striping on the ocean floor shows alternating bands of normal and reversed magnetic polarity, aligned symmetrically with mid - ocean ridges, indicating new crust forms there as magma solidifies and records Earth’s magnetic field. Second, the age of oceanic crust increases with distance from mid - ocean ridges; for example, near ridges, crust is young (e.g., less than 20 million years old), while farther away, it’s older, consistent with new crust being created at ridges and moving outward.

Answer:

Seafloor spreading is supported by magnetic striping (alternating normal/reversed polarity bands symmetric to mid - ocean ridges, from magma solidifying and recording Earth’s magnetic field) and crust age patterns (younger near ridges, older farther away, showing new crust forms at ridges and spreads outward).