The observation that marine fossils are located in rocks far above sea level provides evidence that the area was once what?

• A. Underwater
• B. Glacially carved dry land
• C. Volcanically heated
• D. A desert

Answer: (A)

When you find shells or other remains of marine life in rocks that are now far above the sea, it shows those rocks formed in an ocean environment. Sediment containing those organisms settles on the ocean floor and later hardens into rock; over long periods, geological forces can lift that rock up above sea level. So the area was once underwater. The other options don’t fit as well: glacially carved dry land would show ice-formed features rather than marine fossils; volcanic heating would create igneous rocks, not sedimentary rocks with sea fossils; and a desert setting wouldn’t explain preserved marine organisms in rocks now hundreds of miles from the ocean.