Tag: movements of ocean and sea water

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Multiple choice geography ocean currents movements of ocean water movements of ocean and sea water oceanic circulations

The sea waves which are generated due to the occurrence of earthquake and volcanoes are called _____________.

  1. seismic waves

  2. tsunami waves

  3. both a and b

  4. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A tsunami is a series of waves caused by earthquakes or undersea volcanic eruptions. Tsunamis are giant waves and the speed of these waves depends on ocean depth rather than the distance from the source of the wave. Similarly, seismic waves are waves of energy that travel through the Earth's layers and are a result of earthquakes, volcanic eruptions.

Multiple choice geography ocean currents movements of ocean water movements of ocean and sea water oceanic circulations

Which of the following causes waves?

  1. Underwater earthquake

  2. Underwater volcanic eruption

  3. Slippage of seafloor along earthquake fault

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Waves are most commonly caused by wind. This kind of wave is found globally across the open ocean and along the coast. However, most potential precarious waves are caused by underwater disturbances that displace large amounts of water quickly such as earthquake, underwater volcanic eruption or landslide i.e., slippage of the seafloor along an earthquake fault. These cause very big waves known as tsunamis.

Multiple choice geography ocean currents movements of ocean water movements of ocean and sea water oceanic circulations

Arrange the wave generation forces in order of decreasing wave period:
1. Tsunami
2. Wind waves
3. Tides.

  1. 1, 2, 3

  2. 3, 2, 1

  3. 3, 1, 2

  4. 1, 3, 2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Wave periods: Tides have the longest period (12-24 hours), followed by Tsunamis (minutes to hours), and Wind waves (seconds). Decreasing order: Tides, Tsunami, Wind waves (3, 1, 2).

Multiple choice geography ocean currents movements of ocean water movements of ocean and sea water oceanic circulations

Tsunamis generally take birth in ____________.

  1. The ocean deep

  2. The deep sea plain

  3. The continental shelf

  4. The continental slope
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The tsunami height on the continental shelf is lower for steeper slope in comparison to flatter slope. This shows that, as the continental slope becomes flatter, more energy is transmitted to the shelf and higher tsunami height is observed.

Multiple choice geography ocean currents movements of ocean water movements of ocean and sea water oceanic circulations

Choose the odd one out.

  1. Brazil Current

  2. California Current

  3. Gulf stream

  4. Kuro Siwo Current
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

All stream currents are westerly bound currents while California currents are easterly bound currents

Brazil current is the western boundary current of the South Atlantic subtropical gyre. It transports warm water polewards. Near 22 S, the Brazil current splits; one component flows eastward and the other component hugs the coast and flows toward the southwest and interacts with the colder Malvinas Current.

The Gulf Stream, together with its northern extension the North Atlantic Drift is a warm and swift Atlantic ocean current that originates in the Gulf of Mexico and stretches to the tip of Florida, and follows the eastern coastlines of the United States 

The Kuroshio is a north-flowing ocean current on the west side of the North Pacific Ocean. It is similar to the Gulf Stream in the North Atlantic and is part of the North Pacific ocean gyre. As the Gulf stream, it is a strong western boundary current.

California Current is a Pacific Ocean current that moves southward along the western coast of North America, beginning off southern British Columbia and ending off southern Baja California Peninsula. It is considered an Eastern boundary current due to the influence of the North American coastline on its course.

Multiple choice geography ocean currents movements of ocean water movements of ocean and sea water oceanic circulations

Generally the warm ocean currents originate near __________.

  1. Poles

  2. Equator

  3. Lakes

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ocean currents may be cold, warm and hot. Warm ocean currents originate near the equator and move towards the poles or higher latitudes while cold currents originate near the poles or higher latitudes and move towards the tropics or lower latitude. 

Multiple choice geography ocean tsunami and floods movements of ocean and sea water oceanic circulations circulation of ocean water

Tides in the ocean will be highest when __________________.

  1. it is full Moon

  2. Moon is eclipsed

  3. Moon and Sun are pulling at right angles to the Earth

  4. Moon is in new phase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tides are highest (spring tides) during the new moon and full moon phases, when the gravitational pull of the sun and moon are aligned.

Multiple choice geography ocean tsunami and floods movements of ocean and sea water oceanic circulations circulation of ocean water

Which of the following statements about the ocean currents is not correct?

  1. Currents are rivers in the sea

  2. The water moves forward and the currents are felt at the depth as well

  3. They are caused by the unequal temperature of equatorial and polar regions

  4. Generally there is scanty rainfall over the coastal areas where the warm currents flow
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Warm currents generally increase humidity and rainfall in coastal areas, not decrease it. Cold currents are typically associated with dry conditions.