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4.  The Sun, moon and earth come in a
straight line on full moon and new
moon days. The tidal force will be
intense due to the combined influence
of sun and moon.as a result the tides
formed on these days will be stronger.
These are known as Spring Tide.

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7.  The moon and the sun will be at an
angular distance of 90 degree from the
earth after seven days from the full
moon and new moon days. As the sun
and the moon attract the earth from
an angular distance of 90 degree the
tides caused are weak. Such weak
tides are known as neap tides.