Lab 1 (Planet Earth)

Building a Planet PRE-LAB QUESTIONS 1. Which of the following are chemical layers? (Select all that apply.) a. Lithosphere (No) b. Core (Yes) c. Inner Core (No) d. Mantle (Yes) e. Crust (Yes) 2. Given what you know about how the Earth differentiated, what would you expect the interiors of other planets in the solar system to look like? Given what I know about how the Earth differentiated, I would expect the interiors of other planets in the solar system to have an iron-rich core, silicate mantles, and a basaltic crust. Therefore, even though we haven't been to the other planets in our solar system, those are the predictions we can make when talking about the interiors of the other planets. ©2016, eScience Labs

Building a Planet EXERCISE 1 DATA SHEET Table 1. Unknown Rock 1 Density Measurements Table 2. Unknown Rock 2 Density Measurements Table 3. Density of Substances Trial 1 Trial 2 Trial 3 Mass (g) 22.4 22.5 22.4 Volume (V 0 , mL) 100 100 100 Volume (V 1 , mL) 108 108 108 Rock Volume (mL) 8 8 8 Trial 1 Trial 2 Trial 3 Mass (g) 26.6 26.6 26.6 Volume (V 0 , mL) 100 100 100 Volume (V 1 , mL) 110 110 110 Rock Volume (mL) 10 10 10 Material Density ( ρ ) Continental Crust 2.7 g/cm 3 Oceanic Crust 2.9 g/cm 3 Mantle 3.3 g/cm 3 Water 1.0 g/cm 3 ©2016, eScience Labs

Building a Planet 6. Why is it necessary to take the average of multiple trials to find density? Use your work to justify your response. The reason why it is necessary to take the average of multiple trials to find density is that exact density cannot be determined. Even when finding the density for the two unknown rocks they weren’t the exact density that was shown for the substances. For example for unknown rock 1, the density was 2.8 and the density for the oceanic crust was 2.9. Furthermore, for unknown rock 2, the density was 2.66 and the density for continental crust was 2.7. That’s why it is necessary to take the average of multiple trails to find the density. 7. Apply what you have just learned from the exercise to answer and understand the following questions: Imagine you have a rectangular wooden block with dimensions of 10 cm x 3 cm x 8 cm (L x W x H). a. What is the volume of your wooden block? Show your work. V = L x W x H 10cm x 3 cm x 8cm = 240 cm^3 b. What is the density of this wooden block if it has a mass of 168 g? Show your work. Density: p = M/V 168g / 240 cm^3 = .70 g/cm^3 ©2016, eScience Labs

Building a Planet 8. Your wooden block is shown here in a pool of water. Calculate how much of the block lies below the water line using the equation: ` 9. where r is the height below the water and h is the total height of the block. The density of water is given in Table 3. 0.7 / 1 = r / 8 (1)(r) = (8)(0.7) r = (8)(0.7) r = 5.6 10. A section of continental crust with a height of 25 km (h) floats in the mantle. Some of it lies within the mantle (r), and the rest floats above the mantle. How much of the continental crust lies within the mantle? Use the concepts you learned from the previous question and the densities in Table 3 to solve the problem. Continental Crust Density = 2.7 g/cm^3 2.7 / 1 = r / 25 1(r) = (25)(2.7) r = 25(2.7) r = 67.5 ©2016, eScience Labs