Which type of rock is formed in oceans over a long period of time?

The correct answer is Sedimentary Rocks. Sedimentary rocks are formed by the accumulation and compaction of sediments, such as sand, clay, and organic matter, over long periods of time. These sediments often settle in bodies of water like oceans, lakes, and rivers. Over millions of years, layers of sediment are compressed and cemented together to form sedimentary rocks. Among the options:

• Igneous Rocks: Formed from cooled magma or lava, not from ocean sediments.
• Sedimentary Rocks: Correct; they are formed in oceans and other water bodies over long periods.
• Lava Rocks: Another term for extrusive igneous rocks, not formed in oceans over time.
• Metamorphic Rocks: Formed from existing rocks transformed by heat and pressure, not directly in oceans.

Hence, the correct answer is "Sedimentary Rocks".