Finding marine fossils on mountain peaks supports which idea?

• A. Continents move over time
• B. Mountains form only on land
• C. Ocean levels have remained constant
• D. Mountains are formed by erosion

Answer: (A)

Marine fossils on mountain peaks show that those rocks formed in a sea environment long ago and were later lifted up high. This lifting happens because Earth's tectonic plates move and push landmasses together, raising sea-floor rocks into mountains. So, finding marine fossils up on a mountain supports the idea that continents move over time. The other ideas don’t fit as well: mountains aren’t explained merely by erosion, and constant ocean levels wouldn’t account for sea-life fossils being found high above sea level.