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Chapter: 9th Social Science : Geography: Hydrosphere

Distinguish the following

Social Science : Geography: Hydrosphere : Book Back Important Questions, Answers, Solutions : Distinguish the following

Social Science : Geography

HYDROSPHERE


VI. Distinguish the following

 

1. Spring tide and Neap tide.


Spring Tide

• When the Sun, Moon and Earth are aligned in the same line, the collective gravitation pull of the sun and moon on earth's water strengthens to form a high tide known as spring tide.

• Such tides always occur on full moon and new moon days.

Neap Tide

• When the Sun and the Moon are at right angles, their gravitational forces work against each other, causing a low tide called neap tide.

• A neap tide occurs between two spring tide i.e, twice a month, when the first and last quarter moon appears.

 

2. Abyssal plains and Ocean deeps.


Abyssal Plains

• These are underwater plains found on the deep ocean floor.

• These are usually covered by the thick layer of sediments composed of clay, silt and sand, brought by the rivers.

• These gradient of the slope is veiy gentle and it appears as a uniform flat and featureless plain.

Oceanic Deeps

• These are the deepest part of the oceans.

• They are sediment free.

• Most trenches are V-shaped with steep sides.

 

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