7th Geo - Lesson.5 Interior of the Earth

Lesson.5 Interior of the Earth

1. Nife is made up of _________.

1. Nickel and ferrous
2. Silica and aluminum
3. Silica and magnesium
4. Iron and magnesium

Ans : Nickel and ferrous

2. Earthquake and volcanic eruption occur near the edges of ___________.

1. Mountain
2. Plains
3. Plates
4. Plateaus

Ans : Mountain

3. The magnitude of an earthquake is measured by ___________.

1. Seismograph
2. Richter scale
3. Ammeter
4. Rotameter

Ans : Richter scale

4. The narrow pipe through which magma flow out is called a ___________.

1. Vent
2. Crater
3. Focus
4. Caldera

Ans : Vent

5. ___________ Volcano is known as light house of Mediterranean Sea.

1. Stromboli
2. Krakota
3. mid – Arctic
4. Kilimanaro

Ans : Stromboli

6. ___________ belt is known as the “Ring of Fire”.

1. Circum – Pacific
2. Mid – Atlantic
3. Mid – Arctic
4. Antarctic

Ans : Circum – Pacific

II. Fill in the Blanks.

1. The core is separated from the mantle by a boundary called _________.

Ans : Welchart- Gutenbery discontinuity

2. The earthquake waves are recorded by an instrument known as _________.

Ans : seismograph

3. Magma rises to the surface and spreads over a vast area is known as _________.

Ans : fissure eruption

4. An example for active volcano is _________.

Ans : St.Helens USA

5. Seismology is the study of _________.

Ans : earthquakes

III. Circle the odd one

1) crust, magma, core, mantle

Ans : magma

2) focus, epicenter, vent, seismic waves

Ans : vent

3) Uttar Kashi, Chamoli, Koyna, Krakatoa

Ans : Krakatoa

4) lava, caldera, silica, crater

Ans : silica

5) Stromboli, Helens, Hawaii, Fujiyama

Ans : Fujiyama

IV. Match the following

1. Earth quake	Japanese term
2. Sima	Africa
3. Pacific Ring of Fire	Sudden movement
4. Tsunami	Silica and magnesium
5. Mt. Kenya	World volcanoes
Ans : 1 – C, 2 – D, 3 – E, 4 – A, 5 – B

V. Consider the following statement and tick ( √ ) the appropriate answer. 

1. Assertion (A) : There structure of the earth may be compared to that of an Apple.

Reason (R) : The interior of the earth consists of crust, mantle and core.

1. A and R are correct and A explains R.
2. A and R are correct but A does not explain R.
3. A is incorrect but R is correct.
4. Both A and R are incorrect.

Ans : A and R are correct and A explains R.

2. Assertion (A) : ThePacific Oceanincludes two thirds of the world’s volcanoes.

Reason (R) : The boundary along the Eastern and Western coast areas of the Pacific Ocean is known as the Pacific Ring of Fire.

1. A and R are correct and A explains R.
2. A and R are correct but A does not explain R.
3. A is incorrect but R is correct.
4. Both A and R are incorrect.

Ans : A and R are correct and A explains R.

VI. Answer in a word.

1. Name the outer most layer of the earth.

Crust.

2. What is SIAL?

Silica and Alumina.

3. Name the movement of the Earth’s lithospheric plates?

Tectonic movements.

4. Give an example of extinct volcano.

Mt. Kilimanjaro and Mt. Kenya of Africa.