7th Geography Term 1 Unit 1 Book Back Solutions

Samacheer Kalvi 7th Geography Term 1 Unit 1 Social Book Back Question and Answers:

Samacheer Kalvi 7th Standard New Social Book Back 1 Mark and 2 Mark Question & Answers PDF uploaded and available below. Class 7 New Syllabus 2021 to 2022 Book Back Question & Answer solutions available for both English and Tamil Medium. Class 7 Geography Book Term 1 Unit 1 – Interior of the Earth Answers/Solutions are provided on this page. 7th Std Social Book is of 1st Term consists of 10 units, 2nd Term consists of 7 units and Term 3rd consists of 10 Units. All Units/Chapters of Term 1st, 2nd, 3rd Social Book Back One, and Two Mark Solutions are given below.

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Samacheer Kalvi 7th Social Book Back Unit 1 Term 1 Answers/Solutions Guide PDF:

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Geography – Term 1 Unit 1

Interior of the Earth

I. Choose the correct answer:

1. Nife is made up of …………..
a) Nickel and ferrous
b) Silica and aluminum
c) Silica and magnesium
d) Iron and magnesium
Answer: a) Nickel and ferrous

2. Earthquake and volcanic eruption occur near the edges of ……………..
a) Mountain
b) Plains
c) Plates
d) Plateaus
Answer: c) Plates

3. The magnitude of an earthquake is measured by ……………..
a) Seismograph
b) Richter scale
c) Ammeter
d) Rotameter
Answer: b) Richter scale

4. The narrow pipe through which magma flow out is called a ………………..
a) Vent
b) Crater
c) Focus
d) Caldera
Answer: a) Vent

5. ………….. Volcano is known as light house of Mediterranean Sea.
a) Stromboli
b) Krokota
c) Fujiyana
d) Kilinanjaro
Answer: a) Stromboli

6. ………………. belt is known as the “Ring of Fire”.
a) Circum – Pacific
b) Mid – Atlantic
c) Mid – Continental
d) Antarctic
Answer: a) Circum – Pacific

II. Fill in the blanks:

1. The core is separated from the mantle by a boundary called……………….
Answer: Weichart – Gutenberg discontinuity

2. The earthquake waves are recorded by an instrument known as ……………….
Answer: Seismograph

3. Magma rises to the surface and spreads over a vast area is known as ……………….
Answer: Lava

4. An example for active volcano ……………….
Answer: Mauna Loa in Hawaii /Mt. Strampoli / St. Helens / Pinatubo

5. Seismology is the study of ……………….
Answer: Earthquakes

III. Circle/Underline the odd one:

1) crust, magma, core, mantle
2) focus, epicenter, vent, seismic waves
3) Uttar Kashi, Chamoli, Koyna, Krakatoa
4) lava, caldera, silica, crater
5) Stromboli, Helens, Hawaii, Fujiyama

Answer:

1) crust, magma, core, mantle
2) focus, epicenter, vent, seismic waves
3) Uttar Kashi, Chamoli, Koyna, Krakatoa
4) lava, caldera, silica, crater
5) Stromboli, Helens, Hawaii, Fujiyama

IV. Match the following:

Question:

1. Earth quake	a) Japanese term
2. Sima	b) Africa
3. Pacific Ring of Fire	e) Sudden movement
4. Tsunami	d) Silica and magnesium
5. Mt. Kenya	e) World volcanoes

Answer:

1. Earth quake	c) Sudden movement
2. Sima	d) Silica and magnesium
3. Pacific Ring of Fire	e) World volcanoes
4. Tsunami	a) Japanese term
5. Mt. Kenya	b) Africa

V. Consider the foiiowirig statementand (✓) 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.
a) A and R are correct and A explains R
b) A and R are correct but A does not explain R
c) A is incorrect but R is correct
d) Both A and R are incorrect
Answer: b) A and R are correct but A does not explain R

2. Assertion (A): The Pacific Ocean includes 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.
a) A and R are correct and A explains R
b) A and R are correct but A does not explain R
c) A is incorrect but R is correct
d) Both A and R are incorrect A
Answer: a) A and R are correct and A explains R

VI. Answer in a word:

1. Name the outermost layer of the earth.
Answer: The crust

2. What is SIAL?
Answer:
The upper part of the crust i.e., Silica and Alumina.

3. Name the movement of the Earth’s lithospheric plates?
Answer: Techtonic Movements

4. Give an example of an extinct volcano
Answer: Mt. Popa of Myanmar

VII. Give reason:

1. No one has been able to take samples from the interior of the earth
Answer:
The innermost layer of the earth is called the core. The central core has very high temperature and pressure. So no one has been able to take samples from the interior of the earth.

2. The Continent crust is less dense than the oceanic crust.
Answer:
Despite the greater thickness, the continental crust is less dense than the oceanic crust because it is made of both light and dense rock types.