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Name:_________________________________ Isostatic Equilibrium Pre-Lab Exercise Note: You will need a calculator for some of the questions here. Two decimal places is adequate for number answers. (For example 2.16 is fine, don’t write 2.157386282.) PART 1: Volume, mass, and density 1) What is the density of water in these units? ______________ pounds per gallon ______________ pounds per cubic foot ______________ kilograms per liter (kg/l) ______________ grams per cubic centimeter (g/cm3) 2) A dog weighs 45 pounds; what is that in grams? _____________ g 3) What method of measuring volume could you use to measure the volume of a geometric object like a sphere, cylinder, or rectilinear block? Answer:_______________________________ 4) What method of measuring volume could you use to measure the volume of an object that has an irregular shape, like a rock? Answer:_______________________________ 5) Imagine a brick that measures 20 cm long by 12 cm wide by 7 cm thick. What is the volume of the brick in cubic centimeters (cm3) 6) The brick in 5) above has a mass of 3940 grams (g). What is the density of the brick in grams per cubic centimeter (g/cm3) Note: if your answer is less than 1.0, re-check your calculation. A brick sinks in water, and so it must be denser than 1.0 g/cm3. Density equals mass ÷ volume, not volume ÷ mass. 7) A block of wood measures 32 cm long by 14 cm wide by 2 cm thick. What is the volume of the brick in cubic centimeters (cm3) 8) The block of wood in 7) above has a mass of 540 grams (g). What is the density of the block in grams per cubic centimeter (g/cm3) Note: if your answer is more than 1.0, re-check your calculation. Wood floats in water, and so it must be less dense than 1.0 g/cm3. Density equals mass ÷ volume, not volume ÷ mass. _________________ cm3 ________________g/cm3 _________________ cm3 ________________g/cm3 9) A piece of rock has a mass of 64 grams and displaces 24 cubic centimeters of water when placed in a graduated cylinder. What is the density of the rock in grams per cubic centimeter (g/cm3) ________________g/cm3 PART 2: Isostatic equilibrium video 1) Fill in the blanks based on the video: The Earth has two types of crust: _________________ crust and _______________ crust. The ________________ crust is thicker and less dense, and made mostly of the rock ________________. In contrast, the ________________ crust is thinner and denser, and made mostly of the rock _________________. The differences in thickness and density of the two types of crust control _______________________________________________________________________________. 2) Describe in a paragraph how the demonstration in the video with the two wooden blocks in water relates to the Earth’s two types of crust.
