Page 130 - SST Class 07

A. Tick (3) the right option :
1. The ocean water is ______________ .

(a) saline (b) fresh (c) none of these
2. The deepest point in the Indian Ocean is the ______________ Trench.
(a) Mariana (b) Java (c) none of these
3. The rise of a wave is called a ______________ and its fall is called a ______________ .
(a) crest/trough (b) trough/crest (c) current/crest
4. A tsunami may be caused due to a ______________ _.

(a) cyclone (b) landslide (c) high wave
5. A ______________ tide occurs when the earth, the moon and the sun make a right angle.
(a) spring (b) neap (c) ebb
6. The Hindi name for Full Moon is ______________ .
(a) Amavasya (b) Purnima (c) none of these
7. A warm current flows towards the ______________ .
(a) Equator (b) poles (c) none of these
8. The ______________ is a warm current which makes the European coastal areas warm.

(a) Kurile Current (b) Gulf Stream (c) none of these
B. Match the following :

1. Spring tide u u Having the quality of being mixed with salts.
2. Trough u u A part of the sea with a large curve of the shore.
3. Crest u u A large area partly surrounded by land.
4. Gulf u u The highest tide occuring due to the earth, the sun and the moon
being in one line.
5. Bay u u The low area lying between two hills or waves.
6. Saline u u The top part of a hill or wave.

C. Write ‘T’ for true and ‘F’ for false statements :
1. The Caspian Sea is a sea.
2. Salinity is higher in the Dead Sea than in the Baltic Sea.
3. The Arabian Sea is located near India.
4. The ocean waters remain static all the time.

5. A tsunami can travel faster than a train.
6. A neap tide is the lowest tide.
D. Name any two :
1. water bodies with saline water : (a) ______________ (b) ______________
2. oceans : (a) ______________ (b) ______________
3. seas in the Atlantic Ocean : (a) ______________ (b) ______________
4. movements of ocean water : (a) ______________ (b) ______________

Contemporary Social Science-7
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