Consider the following statements made about the sedimentary rocks: I. Sedimentary rocks are formed at Earth’s surface by the hydrological system. II. The formation of sedimentary rocks involves the weathering of pre-existing rocks. III. Sedimentary rocks contain fossils. IV. Sedimentary rocks typically occur in layers. Which of these statements are correct?

The correct answer is D because all four statements accurately describe the fundamental characteristics and formation process of sedimentary rocks. Statement I is correct because the hydrological system involves water, ice, and wind, which are the primary agents that transport and deposit sediments on the Earths surface. Statement II is correct because sedimentary rocks are formed from the debris derived through the weathering and erosion of igneous, metamorphic, or even older sedimentary rocks. Statement III is correct because these rocks are formed by the accumulation of layers over time, which often traps and preserves the remains of plants and animals, making them the primary source of fossils. Statement IV is correct because the deposition of sediments occurs in distinct successive intervals, resulting in a stratified or layered structure known as strata.