Question

A. Multiple Choice Questions (MCQs)
1. The Earth's crust is broken up into plates moving in relation to each other by about :
(a) 2 m to 5 km (b) 25 cm to 50 cm (c) 2.5 cm to 5 m (d) 2.5 cm to 5 cm

2. A volcano which has not erupted for centuries but may still do so is :
(a) Active volcano (b) Dormant volcano (c) Extinct volcano (d) Dead volcano

3. The study of the behaviour of earthquake waves is called :
(a) Continental Drift (b) Plate tectonics
(c) Seismology
(d) Meteorology

4. Rapids and waterfalls are features formed by :
(a) River erosion (b) River deposition (c) Glacial erosion (d) Sea waves

5. A feature formed due to deposition by sea waves is :
(a) Moraine
(b) Sand dune
(c) Sea cave
(d) Beach

6. After the collapse of the cave roof due to erosion by sea waves, parts of the cave wall are left as
(a) Moraines
(b) Hoodoos
(c) Stacks
(d) Natural arch ​

Answer 1

Answer:

1) b

2) c

3) d

4) b

5) b

6) a

Explanation:

Hope this will help you

Answer 2

Answer:

1. (d) 2.5 cm to 5 cm

2. (b) Dormant Volcano

3. (c) Seismology

4. (a) River erosion

5. (d) Beach

6. (c) Stacks

Explanation:

1) The Earth's crust is broken up into plates moving in relation to each other by about 2.5 cm to 5 cm

• The Earth crust consist of a large, small, rigid and irregular shaped plates (slabs) which consist of ocean floor and continents.
• These slabs or plates move in relation to each other by 2.5 cm to 5 cm each year.

2. A volcano which has not erupted for centuries but may still do so is Dormant Volcano.

• The Dormant volcano is also known as Sleeping Volcanoes.
• These Volcanoes are not erupted for centuries but still do so.
• Examples: Fujiyama in Japan, Vesuvius in Italy, Haleakala on Maui in Hawaii  ( World's Largest dormant volcano)

3. The study of the behavior of earthquake waves is called Seismology.

• Seismology is the study of behavior of Earth quake or seismic waves.
• Seismologist is the person who is expert in the study of pattern of earth quake.

4. Rapids and waterfalls are features formed by River erosion.

• The river cuts out deep V-shaped valley in the solid rock of the landscape due to the erosion of the river.
• Rapids are formed when river jumps over hard rocks and boulder which cannot be easily eroded.

5. A feature formed due to deposition by sea waves is Beach

• Deposition of sediments from the sea waves forms Sea beach.
• Example: Kovallam beach in Kerala, Beaches of Goa, Marina beach in Chennai.

6. After the collapse of the cave roof due to erosion by sea waves, parts of the cave wall are left as Stacks.

• The roof gets collapsed due to the erosion and the part of the cave wall are left as Stacks

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