Question

earths structures
this model of earth shown that it is made up of four parts. the inner core is a solid mass of iron and nickel that has a temperature of about 5,500°c. the outer core surrounds the inner core. it is made up of molten (liquid) iron and nickel that is about the same temperature as the inner core. the mantle is the thickest part of earth. it is made up of semi - molten magma. the outer layer or crust is a thin layer of solid rock.
the crust is thinnest on the ocean floor and thickest where the continents occur. the crust is broken up into tectonic plates that slowly move on the surface of the mantle. where two tectonic plates meet, one is forced under the other and plunges into the mantle.
this model also shows how thermal energy moves through the mantle
earth was once a fiery, liquid ball. how can the process of earths formation help to explain the layers shown in the model?
a. due to earths magnetic field and the free movement of the liquid matter, the hotter outside became magnetized and the cooler inside did not.
b. due to earths magnetic field and the free movement of the liquid matter, the cooler inside became magnetized and the hotter outside did not.
c. due to gravity and the free movement of the liquid matter, less dense matter was pulled toward the center and more dense matter flowed toward the surface.
d. due to gravity and the free movement of the liquid matter, more dense matter was pulled toward the center and less dense matter flowed toward the surface.

Explanation:

To solve this, we analyze Earth's formation. Earth was a fiery, liquid ball. Gravity acts on matter: more dense (heavier) matter moves toward the center, less dense (lighter) floats to the surface.

• Option A/B: Talk about magnetization, but the question is about layer formation due to density/gravity, not magnetism. Eliminate.
• Option C: Says less dense to center, more dense to surface – this is opposite of density principles (dense sinks, less dense rises).
• Option D: Correctly states more dense matter (like iron/nickel in core) is pulled to center, less dense (rocky crust, mantle materials) float to surface, matching Earth's layered structure (inner core, outer core, mantle, crust) formed as denser materials sank and less dense rose.

Answer:

D. Due to gravity and the free movement of the liquid matter, more dense matter was pulled toward the center and less dense matter floated toward the surface.