Answer: Two rocks that are formed by great pressure are Schist and Marble. Schist is a metamorphic rock that is formed when pre-existing rocks, such as sedimentary or igneous rocks, undergo intense heat and pressure without completely melting. Marble is also a metamorphic rock that is formed from limestone (a sedimentary rock) and contains tiny interlocking grains. Therefore, the correct answers are A. Schist and D. Marble.