ASSESSMENT 9 Multiple Choice. Choose the letter of the correct answer. 1. Which of the following types of rocks is most common on Earth's surface? a. Igneous b. Sedimentary c. Metamorphic 2. Which part of the rock layers is the oldest? a. Top part b. Middle part c. Bottom part 3. What is the other term for rock layers? a. Strata b. Sediments c. Sedimentary 4. Which of the following Steno's principles of sedimentary layers states that younger layers of rock sit atop older layers? a. Principles of Superposition b. Principle of Original horizontality c. Principal of Lateral continuity 5. It states that sedimentary rocks are originally found in horizontal layers but sometimes they undergo change and cause them to be tilted? a. Principles of Superposition b. Principle of Original horizontality c. Principal of Lateral continuity​