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SAI INTERNATIONAL SCHOOL

SUBJECT – GEOGRAPHY STD VII
TOPIC- LESSON -5 WATER
SUB TOPIC- WAVES
HOME ASSIGNMENT
OBJECTIVE
1-Which of these BEST describes the cause of waves in the ocean?
a) high and low tides
b) evaporation of water
c) wind blowing across the surface of the ocean
d) ridges and trenches on the bottom of the ocean

2-A tsunami is an unusually large wave caused by

a) an earthquake or volcano
b) increased gravitational pulls when the sun and moon line up
c) a heat wave
d) extreme winds

3-The two main parts of a wave are?
a) Wavelengths and wave heights.
b) Swells and whitecaps.
c) Crests and troughs.
d) Rises and dips.

4-An earthquake causes a tsunami because force from the quake?
a) meets the force of currents flowing in a different direction.
b) Blows surface water away from the shore.
c) Pulls water down toward the source of the quake.
d) Pushes a large body of water up from the ocean floor.

5-A tsunami is ______________ .
a) a tidal surge caused by a storm
b) a large wave caused by an undersea event
c) an earthquake which causes a large wave
d) an undersea landslide
6-What does the word "tsunami" mean in Japanese?

a) Tidal wave
b) Harbor wave
c) Killer wave
d) Century wave