Final answer:
The densities of two sets of sedimentary rocks or other substances such as sugar and salt can differ due to the principles of differentiation and physical properties. Not all matter had the same density as exemplified both in cosmic structures and the Earth's layers. A simple experiment of weighing equal volumes of sugar and salt can demonstrate the concept of different densities.
Step-by-step explanation:
The question of whether two sets of sedimentary rocks, sugar, and salt have the same densities when formed is rooted in the principles of differentiation and physical properties. In the universe's early history, as the universe expanded some regions denser than others began collapsing into various large structures, indicating that not all matter had the same density.
Similarly, the Earth's layers, which formed by the process of differentiation, have different densities, evidenced by the planet's bulk density compared to its surface materials. Furthermore, a Take-Home Experiment with sugar and salt provides a hands-on approach to understanding that two substances, having the same volume, can have different densities. One could weigh both substances to find any mass difference, which would be attributed to the different densities, including the air space between crystals.