Question

choose all examples of scientific evidence for seafloor spreading.

magnetic strips of rock on the ocean floor
the differences in ocean current temperatures
undersea rock formations
a pattern of variations in ages of different parts of the seafloor
the presence of continents

Explanation:

Analyze seafloor spreading evidence

Seafloor spreading is supported by several key lines of geological evidence:

• Magnetic stripes: Symmetrical patterns of magnetic reversals recorded in basaltic rock on both sides of mid-ocean ridges.
• Age of the seafloor: Rocks are youngest near the mid-ocean ridge crest and become progressively older farther away from the ridge.
• Undersea rock formations: Pillow lavas and basaltic structures at mid-ocean ridges indicate active volcanic eruptions forming new crust.

Evaluate the given options

• magnetic strips of rock on the ocean floor: Valid evidence (magnetic anomalies).
• the differences in ocean current temperatures: Invalid (related to oceanography/climate, not crustal spreading).
• undersea rock formations: Valid evidence (pillow basalts at ridges).
• a pattern of variations in ages of different parts of the seafloor: Valid evidence (crustal age increases with distance from the ridge).
• the presence of continents: Invalid (continental presence alone does not prove seafloor spreading).

Answer:

• magnetic strips of rock on the ocean floor (Correct answer)
• the differences in ocean current temperatures
• undersea rock formations (Correct answer)
• a pattern of variations in ages of different parts of the seafloor (Correct answer)
• the presence of continents