Composition of the Earth

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Earth's Layers

The Earth is roughly spherical and consists of four layers: crust, mantle, outer core, and inner core.
The crust is the thinnest layer, 6–70 km thick, made of rock, and divided into tectonic plates.
The mantle is ~3000 km thick, made of mostly solid rock that flows slowly; convection currents here move tectonic plates.
The outer core is a liquid layer ~2000 km thick, primarily iron and nickel, responsible for Earth's magnetic field.
The inner core has a radius of ~1400 km, is the hottest layer at ~6000 °C, but is solid due to immense pressure.
Temperature generally increases with depth.

Composition of the Crust

Most abundant element in Earth's crust: oxygen (46%).
Second most abundant: silicon (28%).
Third: aluminium (8%).
Fourth: iron (6%).

Cross-section of Earth showing the four layers: crust, mantle, outer core, inner core.

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Câu hỏi luyện tập

Xem trước miễn phí — 8 trên 57 câu hỏi. Đăng ký để xem tất cả.

1.What is the layer at the centre of the Earth?
Easy
- AInner core
- BOuter core
- CMantle
- DCrust
2.Which layer of the Earth is the thickest?
Easy
- AMantle
- BCrust
- COuter core
- DInner core
3.What is the approximate thickness of the crust?
Easy
- A6 to 70 km
- B3000 km
- C2000 km
- D1400 km
4.Which layer of the Earth is the hottest?
Easy
- AInner core
- BOuter core
- CMantle
- DCrust
5.What is the most abundant element in the Earth's crust?
Easy
- AOxygen
- BSilicon
- CAluminium
- DIron
6.What is responsible for the Earth's magnetic field?
Easy
- AThe outer core
- BThe inner core
- CThe mantle
- DThe crust
7.What are the different parts that the crust is divided into?
Easy
- ATectonic plates
- BConvection currents
- CContinents
- DLayers
8.What do convection currents in the mantle lead to?
Easy
- AMovement of tectonic plates
- BEarth's magnetic field
- CFormation of the crust
- DHeating of the core

Thêm câu hỏi

9.What happens to the temperature of the Earth as depth increases?
Easy
- AIt increases
- BIt decreases
- CIt stays the same
- DIt fluctuates randomly
10.What is the crust made of?
Easy
- ARock
- BIron and nickel
- CSolid rock that flows slowly
- DLiquid iron and nickel
11.Why is the inner core solid despite being hotter than the outer core?
Medium
- AIt experiences more pressure
- BIt is made of different materials
- CIt is closer to the centre
- DIt has a lower density
12.What is the radius of the inner core?
Easy
- A1400 km
- B2000 km
- C3000 km
- D6 to 70 km
13.The diagram shows a cross-section of the Earth. If the radius of the inner core is 1400 km, what is the approximate diameter of the inner core?
Easy
- A700 km
- B1400 km
- C2800 km
- D4200 km
14.The Earth's crust has an average thickness of 35 km. If the total radius of the Earth is 6371 km, what percentage of the Earth's radius is the crust?
Medium
- A0.55%
- B1.82%
- C5.5%
- D18.2%
15.If the mantle is 3000 km thick and the outer core is 2000 km thick, what is the total thickness of the mantle and outer core combined?
Easy
- A1000 km
- B5000 km
- C6000 km
- D7000 km
16.Which statement about the Earth's layers is correct?
Medium
- AThe crust is the thickest layer.
- BThe mantle is the thinnest layer.
- CThe outer core is liquid.
- DThe inner core is liquid.
17.If the Earth's crust contains 46% oxygen and 28% silicon, what is the combined percentage of these two elements?
Easy
- A74%
- B64%
- C18%
- D82%
18.A student claims that the mantle is completely solid. Based on the source, which statement best corrects this misconception?
Medium
- AThe mantle is completely liquid.
- BThe mantle is mostly solid but flows slowly over time.
- CThe mantle is a mixture of solid and liquid like a slurry.
- DThe mantle is solid only in the upper part and liquid in the lower part.
19.What is the Earth's crust made of?
Easy
- AIron and nickel
- BRock
- CLiquid magma
- DSolid metal
20.Which two elements are the main components of the Earth's outer core?
Easy
- AOxygen and silicon
- BIron and nickel
- CAluminium and iron
- DSilicon and aluminium
21.The inner core is at a temperature of 6000 °C, yet it is solid. Which statement explains this?
Medium
- AThe inner core is made of a different material that has a higher melting point.
- BThe pressure in the inner core is very high, keeping it solid.
- CThe inner core is actually liquid but appears solid due to pressure.
- DThe inner core has cooled down enough to solidify.
22.Which layer of the Earth is responsible for generating the magnetic field?
Easy
- ACrust
- BMantle
- COuter core
- DInner core
23.What is the approximate thickness of the Earth's crust?
Easy
- A6 to 70 km
- B3000 km
- C2000 km
- D1400 km
24.Which layer of the Earth is composed primarily of iron and nickel?
Easy
- ACrust
- BMantle
- COuter core
- DInner core
25.What is the approximate thickness of the mantle?
Easy
- A6 to 70 km
- B2000 km
- C3000 km
- D1400 km
26.A student draws a cross-section of the Earth and labels the layers. Which sequence from the surface to the centre is correct?
Easy
- ACrust → outer core → mantle → inner core
- BCrust → mantle → outer core → inner core
- CMantle → crust → outer core → inner core
- DCrust → mantle → inner core → outer core
27.If the Earth's total radius is 6371 km and the crust has an average thickness of 35 km, what is the approximate thickness of the mantle and core combined?
Medium
- A6336 km
- B6406 km
- C6300 km
- D6000 km
28.The Earth's crust contains 46% oxygen and 28% silicon. What is the percentage of other elements combined?
Easy
- A26%
- B74%
- C18%
- D82%
29.If the Earth's radius is 6371 km and the inner core radius is 1400 km, what is the approximate volume of the inner core? (Volume of sphere = 4/3 π r³)
Hard
- A1.15 × 10¹⁰ km³
- B1.15 × 10⁹ km³
- C1.15 × 10¹¹ km³
- D1.15 × 10¹² km³
30.What is the approximate thickness of the Earth's mantle?
Easy
- A6 to 70 km
- B2000 km
- C3000 km
- D1400 km
31.Which layer of the Earth is liquid?
Easy
- ACrust
- BMantle
- COuter core
- DInner core
32.What is the Earth's crust primarily made of?
Easy
- AIron and nickel
- BRock
- CLiquid metal
- DSolid metal
33.Which element is the second most abundant in the Earth's crust?
Easy
- AOxygen
- BAluminium
- CSilicon
- DIron
34.The Earth's inner core is solid because:
Medium
- Ait is cooler than the outer core
- Bit is under immense pressure
- Cit is made of rock
- Dit is farther from the surface
35.What is the approximate radius of the inner core?
Easy
- A3000 km
- B2000 km
- C1400 km
- D35 km
36.If the Earth's total radius is 6371 km and the crust thickness is 35 km, what is the combined thickness of the mantle and core?
Medium
- A6336 km
- B6406 km
- C6306 km
- D6000 km
37.Which layer of the Earth is responsible for the magnetic field?
Easy
- ACrust
- BMantle
- COuter core
- DInner core
38.Which of the following correctly lists the Earth's layers from the surface to the centre?
Easy
- ACrust, mantle, inner core, outer core
- BCrust, mantle, outer core, inner core
- CMantle, crust, outer core, inner core
- DCrust, outer core, mantle, inner core
39.If the Earth's crust contains 46% oxygen and 28% silicon, what is the combined percentage of aluminium and iron?
Medium
- A26%
- B14%
- C8%
- D6%
40.What is the mantle made of?
Medium
- ALiquid iron and nickel
- BSolid rock that flows slowly
- CSolid metal
- DLiquid rock
41.Which layer of the Earth is the thinnest?
Easy
- ACrust
- BMantle
- COuter core
- DInner core
42.The Earth's mantle is completely solid.
Easy
True or false?
43.The temperature of the Earth decreases with depth.
Easy
True or false?
44.Which of the following are layers of the Earth? (Select all that apply)
Medium
- ACrust
- BMantle
- CAtmosphere
- DOuter core
- EInner core
45.Arrange the Earth's layers in order from the surface to the centre.
Easy
- Inner core
- Crust
- Outer core
- Mantle
46.Match each layer to its description.
Medium
- Crust
- Mantle
- Outer core
- Inner core
- Solid, iron and nickel, 1400 km radius
- Liquid, iron and nickel, generates magnetic field
- Thin rock layer, 6-70 km thick
- Mostly solid rock, flows slowly, 3000 km thick
47.Match each layer of the Earth to its correct description.
Medium
- Crust
- Mantle
- Outer core
- Inner core
- Liquid layer of iron and nickel
- Thinnest layer, made of rock
- Solid layer due to high pressure
- Thickest layer, flows slowly
48.Which of the following are true about the Earth's crust? (Select all that apply)
Medium
- AIt is the thinnest layer of the Earth.
- BIt is made of rock.
- CIt is divided into tectonic plates.
- DIt is approximately 3000 km thick.
- EIt contains 46% oxygen.
49.The Earth's magnetic field is generated by the inner core.
Easy
True or false?
50.Which of the following is the correct order of the four most abundant elements in the Earth's crust, from most to least abundant?
Medium
- AOxygen, silicon, aluminium, iron
- BSilicon, oxygen, iron, aluminium
- COxygen, aluminium, silicon, iron
- DIron, aluminium, silicon, oxygen
51.Complete the sentence.
Easy
The Earth's crust is divided into different parts called ____.
52.What is the radius of the inner core in km?
Easy
53.Complete the sentence: The Earth's crust is divided into different parts called ___.
Easy
The Earth's crust is divided into different parts called ____.
54.The Earth's mantle is approximately 3000 km thick and the outer core is approximately 2000 km thick. What is the combined thickness of the mantle and outer core in km?
Medium
55.Explain why the inner core is solid even though it is hotter than the outer core.
Hard
56.What is the radius of the inner core in km?
Easy
- A1260 km
- B1540 km
- C1400 km
- D1680 km
57.The Earth's mantle is approximately 3000 km thick and the outer core is approximately 2000 km thick. What is the combined thickness of the mantle and outer core in km?
Medium
- A5500 km
- B4500 km
- C5000 km
- D6000 km

Ghi chú ôn tập

## Composition of the Earth The Earth is roughly spherical and consists of four layers: - **Crust**: The thinnest layer (6–70 km thick). Made of rock. Divided into tectonic plates. - **Mantle**: ~3000 km thick. Mostly solid rock that flows slowly. Convection currents here move tectonic plates. - **Outer core**: 2000 km thick, liquid, made of iron and nickel. Responsible for Earth's magnetic field. - **Inner core**: 1400 km radius, hottest layer at 6000°C, but solid due to high pressure. Temperature increases with depth. ### Most abundant elements in Earth's crust: 1. Oxygen (46%) 2. Silicon (28%) 3. Aluminium (8%) 4. Iron (6%)

Crust: The thinnest layer of the Earth at 6 to 70 km thick, made of rock, divided into tectonic plates.
Mantle: The layer below the crust, around 3000 km thick, made of mostly solid rock that flows slowly over time.
Outer core: A liquid layer below the mantle, 2000 km thick, primarily made of iron and nickel, responsible for Earth's magnetic field.
Inner core: The centre of the Earth, 1400 km radius, hottest layer at 6000°C, solid due to high pressure.
Tectonic plates: Different parts that the crust is divided into.
Convection currents: Currents in the mantle that slowly move the tectonic plates.

Thẻ ghi nhớ

What are the four layers of the Earth?

Crust, mantle, outer core, inner core.

What is the thinnest layer of the Earth?

The crust, which is 6 to 70 km thick.

What is the thickest layer of the Earth?

The mantle, which is around 3000 km thick.

What is the outer core made of?

Primarily iron and nickel.

What is the inner core made of?

Primarily iron and nickel, but solid.

What is the temperature of the inner core?

6000 °C, the hottest layer.

Why is the inner core solid despite high temperature?

Because it experiences more pressure than the other layers.

What is responsible for the Earth's magnetic field?

The outer core, which is liquid and made of iron and nickel.

What are tectonic plates?

The different parts that the crust is divided into.

What causes tectonic plates to move?

Convection currents in the mantle.

What is the mantle made of?

Mostly solid rock that flows slowly over time.

How does temperature change with depth in the Earth?

Generally, temperature increases with depth.

What is the most abundant element in the Earth's crust?

Oxygen (46%).

What is the second most abundant element in the Earth's crust?

Silicon (28%).

What is the third most abundant element in the Earth's crust?

Aluminium (8%).

What is the fourth most abundant element in the Earth's crust?

Iron (6%).

What is the crust made of?

Rock.

What is the thickness of the outer core?

2000 km.

What is the radius of the inner core?

1400 km.

What is the state of the outer core?

Liquid.

What is the state of the inner core?

Solid.

What is the state of the mantle?

Mostly solid rock that flows slowly.

Name the layers of the Earth from outermost to innermost.

Crust, mantle, outer core, inner core.

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