Question

the composition of rocks affects their densities and the densities of earth’s layers. use what you have learned and the information in the table to answer the question.

rock/mineral | density (g/cm³)
--- | ---
iceland | 3.45
perovskite | 4.03
lherzolite | 2.50
olivine | 4.29

1. which two listed rocks and minerals to be found in the layers of earth from the crust to the lower mantle?

a) iceland, perovskite, olivine, spinel
b) lherzolite, olivine, perovskite, eclogite
c) perovskite, lherzolite, olivine, or eclogite
d) olivine, peridotite, eclogite, olivine

Explanation:

To determine the correct option, we analyze the density of Earth's layers. The crust has lower density (around 2.7 - 3.0 g/cm³ for continental, 3.0 - 3.3 for oceanic), mantle (3.3 - 5.5 g/cm³), and core (higher). The rock/mineral densities: 1. Eclogite (3.45) – close to lower crust or upper mantle. 2. Perovskite (4.03) – mantle. 3. Fayalite (2.50) – too low (more like crustal but lower than typical crust? Wait, maybe a typo or different context). 4. Stishovite (4.29) – mantle or core transition. The layers from crust to lower mantle: crust (lowest density), then upper mantle, then lower mantle (higher density). The option with rocks/minerals matching increasing density (crust - mantle - lower mantle) should have lower density rocks first (like fayalite? Wait, no, fayalite is 2.50, eclogite 3.45, perovskite 4.03, stishovite 4.29. Wait, the question is about "from the crust to the lower mantle" – so order of density increasing. The correct sequence should be rocks with lower density (crustal) to higher (lower mantle). Let's check the options:

Option 1: Eclogite, Perovskite, Olivine, Stishovite – No, olivine density? Wait, maybe the correct option is the one with fayalite (2.50, crustal-like), eclogite (3.45, lower crust/upper mantle), perovskite (4.03, mantle), stishovite (4.29, lower mantle). Wait, the second option: "Fayalite, Perovskite, Eclogite, Stishovite" – No, order wrong. Wait, the third option: "Eclogite, Perovskite, Fayalite, Stishovite" – No. Wait, the fourth option: "Fayalite, Eclogite, Perovskite, Stishovite" – Let's check densities: Fayalite (2.50) < Eclogite (3.45) < Perovskite (4.03) < Stishovite (4.29). This matches the increasing density from crust (fayalite, lower density) to lower mantle (stishovite, higher density). Wait, but maybe I misread. Wait, the question is "which two listed rocks and minerals to be found in the layers of Earth from the crust to the lower mantle?" Wait, no, the options are sequences. Wait, the correct sequence should have density increasing as we go from crust to lower mantle. So the lowest density first (fayalite, 2.50 – maybe crustal), then eclogite (3.45 – lower crust/upper mantle), then perovskite (4.03 – mantle), then stishovite (4.29 – lower mantle). So the option with Fayalite, Eclogite, Perovskite, Stishovite? Wait, looking at the options:

Option 1: Eclogite, Perovskite, Olivine, Stishovite – No.

Option 2: Perovskite, Fayalite, Eclogite, Stishovite – No, order wrong.

Option 3: Eclogite, Perovskite, Fayalite, Stishovite – No.

Option 4: Fayalite, Eclogite, Perovskite, Stishovite – Yes, because 2.50 < 3.45 < 4.03 < 4.29, matching the density increase from crust (fayalite) to lower mantle (stishovite). Wait, but maybe the fourth option is "Fayalite, Eclogite, Perovskite, Stishovite" (the last option in the image, maybe labeled as D or the fourth circle). So the correct answer is the option with Fayalite, Eclogite, Perovskite, Stishovite (the fourth option, likely the last one in the list).

Answer:

The fourth option (the one with "Fayalite, Eclogite, Perovskite, Stishovite")