std 7 geography chapter3 tides Exercise question answer, Exercise 7th std geography chapter3 tides
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sz edu tutorial
Q. 1. Prepare a chain by matching the following.
Group A
Group B
Group C
8th phase of the moon Objects get thrown towards the outer side.
(Quarter)
Waves
Centrifugal force
Gravitational force
Spring Tide
Neap Tide
New moon day
Rotation of the earth
Q. 2. Give geographical reasons:
(1) Tides are influenced more by the moon
than the sun.
The moon, the sun and The forces of the sun and the moon operate
the earth
in different directions.
Wind
(2) At some places along the coast, the low
lying areas turn into lagoons or marshy
lands.
Q. 3. Answer in brief.
(3) Place located on the opposite meridian
to the place experiencing high or low
tide will also experience high or low
tide respectively.
(1) If there is high tide at 7 am, find the
timings of the next high and low tides
on the same day at a given place.
(2) If at Mumbai (73° E meridian), there is
high tide at 1.00 pm on Thursday, then
on which other meridian will there be
high tide too? State with reasons.
(3) Explain the reasons for the generation
of waves.
Exercises
Q. 4. In what way will the following depend on
the tides?
(1) Swimming (2) Steering a ship
(3) Fishing
(4) Salt pans.
(5) Going to coastal areas for trips
Highest high tide occurs on this day.
These are also generated due to earthquakes
and volcanoes.
Operates in the direction towards the centre
of the earth.
Q. 5. Observe fig. 3.8 of neap tide and answer
the following questions.
(1) Which phase of the moon does it show?
(2) What are the relative positions of the
moon, the sun and the earth ?
(3) What effect will it have on the tides ?
Q. 6. Differentiate between
(1) High tide and low tide.
(2) Spring tide and neap tide.
Q. 7. Describe the positive and negative effects
of tides.
Activities:
(1)
(2)
Visit the nearest sea coast. From a
higher location, observe the waves
approaching the coast. See if the
approaching waves change their
direction. With the help of your
teacher find the answer to why this
change occurs.
Collect information from the internet
about how electricity is generated
from waves. Find places where such
electricity is being generated.
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