Ocean water movement - class-VIII
|Description: Ocean water movement|
|Number of Questions: 15|
|Created by: Palash Sundaram|
|Tags: oceans and fishing tides and ocean currents geography water water bodies ocean and man hydrosphere the realms of the earth social science the universe and solar system the natural realms of the earth- lithosphere realms of the earth natural resources water on the earth ocean water- land- air|
Neap tides, i.e., small tides are caused when _____________________.
The rise and fall of the sea-water at the surface at constant intervals is known as __________.
Which of the following statements is not correct about the ocean currents?
Which of the following is not an effect of the ocean currents?
Spring tides are caused, when _____________________.
Neap tides occur _______________.
The tides in the seas are influenced both by the sun and the moon. This fact is proved by ________________.
Tides are caused because of ___________________.
The part of the earth which is covered by water is termed as _____________.
The part of the sea which touches the land and is generally not so deep is called ______________.
Which of the following is a type of wave ____________.
Ripples are the instant effect of wind on water and they die down as quickly as they form, as the surface tension of the water dampens their efforts.
Waves always travel in the same direction as the wind is blowing: if the wind changes then the waves change with it. Wave size is determined by the strength of the wind, the length of time it has been blowing and the distance it has blown over or the ‘fetch’.
When strong winds blow for longer than a few hours, it gives the water sufficient energy that it then takes on a character of its own. This character and movement is known as swell, and it will march across open areas of water independent of the wind.
Which is the busiest of Ocean trade routes ?
Large movements of ocean water from places of warm temperature to low temperature or vice versa are ______________.
Kuroshio current is available in ___________.
The north equatorial current turns northward to the obstruction of Philippines and thus gives birth to the Kuroshio current which flows from Taiwan to Ryuku ridge at 30 degrees N latitude. The Kuroshio current is a warm current. The average temperature and salinity are 8 degrees and 35% respectively.
Which factors influence ocean currents?
Factors Influencing Nature and Movement of Ocean Currents:
Factors related to the earth’s rotation: Gravitational force and
force of deflection.
2. Factors originating within the sea: Atmospheric pressure, winds, precipitation, evaporation and insolation.
3. Factors originating within the sea: Pressure gradient, temperature difference, salinity, density and melting of ice.
4. Factors modifying the ocean currents: Direction and shape of the coast, seasonal variations and bottom topography.