Question 1

Which of the following best describes how Earth's internal layers are defined?

Accepted Answer

By their chemical composition and mechanical properties

Question 2

What is the primary reason oceanic crust 'floats' on top of the mantle?

Accepted Answer

It is less dense than the mantle

Question 3

Which layer of Earth is both solid and mobile, allowing for convection currents?

Accepted Answer

Mantle

Question 4

What is the main chemical composition of Earth's crust?

Accepted Answer

Oxygen and silicon

Question 5

Which equation best represents the relationship between density ($$\rho$$), mass ($$m$$), and volume ($$V) in $$Earth's layers?

Accepted Answer

$$\rho = \frac{m}{V}$$

Question 6

Why does the density of Earth's layers increase with depth?

Accepted Answer

Because there is a greater proportion of heavier elements such as Fe and Ni

Question 7

Which layer of Earth is liquid, as revealed by seismic wave behavior?

Accepted Answer

Outer core

Question 8

What is the main reason S-waves cannot pass through the outer core?

Accepted Answer

The outer core is liquid

Question 9

Which of the following is an example of direct evidence for Earth's internal structure?

Accepted Answer

Rocks uplifted from deep crustal and mantle regions

Question 10

Meteorites are important for understanding Earth's interior because:

Accepted Answer

They represent the building blocks of early Earth and other planets

Question 11

Which mechanical layer of Earth is described as ductile and weak?

Accepted Answer

Asthenosphere

Question 12

If a material behaves in a ductile manner, what does this imply about its mechanical properties?

Accepted Answer

It can flow and deform under stress

Question 13

Which of the following best explains why granite and gabbro 'float' on the mantle?

Accepted Answer

They are less dense than mantle rocks

Question 14

Which equation describes the relationship between pressure ($$P$$), force ($$F$$), and area ($$A) in $$Earth's interior?

Accepted Answer

$$P = \frac{F}{A}$$

Question 15

Which of the following is NOT a plausible indirect method for studying Earth's interior?

Accepted Answer

Measuring the temperature of ocean water

Question 16

A volcanic eruption brings up peridotite nodules from the mantle. What does this tell us about the mantle?

Accepted Answer

The mantle contains minerals such as olivine and pyroxene

Question 17

Which layer of Earth is responsible for generating the planet's magnetic field?

Accepted Answer

Outer core

Question 18

If the density of the continental crust is $$2.7\ 	ext{g/cm}^3$$ and the upper mantle is $$3.4\ 	ext{g/cm}^3$$, what happens to the crust when it is placed on the mantle?

Accepted Answer

It floats because it is less dense

Question 19

Which of the following statements about seismic waves is correct?

Accepted Answer

P-waves can travel through both solids and liquids, but S-waves can only travel through solids

Question 20

Which real-world scenario best illustrates the ductile behavior of materials in Earth's mantle?

Accepted Answer

Hot iron being shaped by a blacksmith

Earth’s Internal Structure: Composition, Properties, and Evidence

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