9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Published on: 03/09/2019
Lithosphere – I Endogenetic Processes
Download Tamil Nadu 9th Standard Social Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Social Science Test
1.
The point of origin of an Earthquake is called the ________.
epicentre
focus
seismic wave
magnitude
2.
The movement of plates that creates stress and tension in the rocks causing them to stretch and cracks result in ______
fold
fault
mountain
earthquake
3.
______ is the rigid outer layer of the Earth
core
mantle
Crust
inner core
4.
Primary waves and Secondary waves.
5.
Core and crust
6.
Consider the various sources of information related to the Earth's Interior. Classify the above as DIRECT & INDIRECT sources of information. Give reasons.
7.
Write a note on the internal and external processes of Earth
8.
On the given outline map of the world, mark the following:
a. Pacific Ring of fire
b. Earthquake prone zones (any two)
c. Locate any two active volcanoes of the world.
d. Himalayas and Alps ranges
e. Rift valley of East Africa.
9.
Scientists use GPS to measure the rate of Tectonic Plate movements. Discuss.
1.
(b)
focus
2.
(b)
fault
3.
(c)
Crust
4.
| S.No | Primary Waves | Secondary Waves |
| (i) | These waves are the fastest of all the Earthquake waves and the first to reach the epicentre. | Secondary waves travel less faster than the primary waves. |
| (ii) | These waves pass through solids, liquids and gases. | These waves travel only through solids. |
| (iii) | The average velocity of these waves is 5.3 k.m/sec to 10.6 k.m/second. | The average velocity of these waves is 1 k.m/sec to 8 k.m/second. |
5.
| S.No | Core | Crust |
| (i) | The core is the inner most and hottest layer of the Earth. |
Crust is the outer layer of the Earth where we live. |
| (ii) | It lies below the mantle. | It ranges between 5 to 30 km. |
| (iii) | It is composed mainly of Nickel and Iron. | It is the solid and rigid layer of the Earth. |
| (iv) | Hence it is called NIFE. | The elements of the crust are Silica and Aluminium. It is termed as SIAL. |
6.
1. Seismic activity
2. Earth's magnetism
3. Volcanoes
4. Mined rocks
5. Gravitational force
6. Meteors
Seismic Activity: Frequency and size of earthquake.
Earth's magnetism: Due to the movement of molten material under the earth's crust.
Volcanoes: A rupture in the crust of a planetary mass object such as Earth, that allows hot lava, volcanic ash & gases to escape.
Mined Rocks: Excavating hard minerals.
Gravitational force: A natural phenomenon.
Meteors: A bright streak of light.
7.
The formation and deformation of landforms on the surface of the Earth is a continuous activity of two broad processes i.e. internal and external. These processes cause stress and deformation on Earth materials and finally bring changes on the surface of the Earth. These are referred as Geomorphic Processes.
The forces that act from the Earth's interior towards the Earth's surface are called Internal processes or Endogenetic processes. These forces build the landscape and create topographic relief.
The forces that act on the surface of the Earth due to natural agents like running water, glacier, wind, waves etc. are called External processes or Exogenetic processes. These external processes tear the landscape down into relatively low elevated plains.
8.
a) Pacific Ring of fire: It is a major area and an arc in the_basin of the Pacific ocean where many earthquakes and volcanic eruptions occur.
(b) Earthquake-prone zones (any two): Turkey, Indonesia
(c) Locate any two active volcanoes of the world: Hawaii-, Mount Fuji
(d) Himalayas and Alps ranges
9.
GPS works by sending radio signals from satellites to ground stations. The distance between the satellites and station is recorded. Over time, these distances change slightly. Scientists can measure the rate of Tectonic Plate movements by recording the time it takes for ground stations to move a given distance.
9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
