w YoState, most of the surface bedrock was formed as a result of which process? a. deposition of sediments into a vast of sea. b, folding of non sedimentary rock. c. metamorphism of sedimentary rock. d. intrusion of magma into sedimentary rock.
To determine the correct answer, we need to understand the different geological processes that can form bedrock.
a. Deposition of sediments into a vast sea: This process forms sedimentary rock, which is made up of compacted sediments such as sand, mud, and organic remains. Sedimentary rocks are commonly found in areas that were once covered by seas, lakes, or riverbeds.
b. Folding of non-sedimentary rock: This process involves the deformation of pre-existing rocks due to tectonic forces. It can result in the formation of folds, bends, and wrinkles in the rock layers. However, it doesn't directly form bedrock.
c. Metamorphism of sedimentary rock: Metamorphism occurs when pre-existing rocks undergo changes in their mineralogy, texture, and structure due to high pressure, temperature, or chemical processes. While metamorphism can affect sedimentary rocks and lead to the formation of new rocks like marble or slate, it doesn't explain the formation of most surface bedrock.
d. Intrusion of magma into sedimentary rock: This process involves the intrusion of molten rock (magma) into existing rock layers. When magma cools and solidifies underground, it forms igneous rock. If this igneous rock becomes exposed at the Earth's surface through erosion, it becomes surface bedrock.
Based on the given options, the most plausible answer is d. intrusion of magma into sedimentary rock. This process, known as intrusion or igneous intrusion, often occurs in areas where igneous activity has taken place, leading to the formation of surface bedrock.