Question

1) Find out the names of a few rivers of the world that form a delta . [4 MARKS]

2) Imagine if a quake suddenly shook in the middle of the school day, where you go for safety ? [4 MARKS]

3) Define the earth quakes waves in detail. [4 MARKS]

7th std - Ncert CBSE

Chp. = 3 - Our changing earth


CONTENT QUALITY NEEDED !

ANSWER ALL QUESTIONS

Answer 1

1. sundarban delta
2.under the table
3.the sudden shaking of the earth crust take place on account of release of energy such occurrence of shock wave or seismic wave is called the earthquake wave.

Answer 2

"1. Changjiang (Yangtze), Pearl, Red, Mekong, Irrawaddy, Ganges- Brahmaputra and Indus.

2. If a quake suddenly shook in the middle of the school day we will move to the ground or open area away from buildings.

3. An earthquake generates three types of seismic waves primary waves ( P) , secondary waves ( S) and the surface waves.Both Primary waves and secondary waves penetrate the interior of the Earth due to which both waves are known as “body waves” while surface waves not.

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