Q1- Name the three moments of ocean water. Explain in
detail.
Q2 - How are high tides useful?
Q3 - What are spring tides and Neap tides? Show with a help of diagram.
Q4 - Name warm current and cold current.
Answers
Answer:
1)Ocean water is constantly in motion: north-south, east-west, alongshore, and vertically. Seawater motions are the result of waves, tides, and currents . Ocean movements are the consequence of many separate factors: wind, tides, Coriolis effect, water density differences, and the shape of the ocean basins.
Explanation:
Ocean waves transfer energy through the water over great distances.
Waves
Waves have been discussed in previous chapters in several contexts: seismic waves traveling through the planet, sound waves traveling through seawater, and ocean waves eroding beaches. Waves transfer energy and the size of a wave and the distance it travels depends on the amount of energy that it carries.
Wind Waves
This lesson studies the most familiar waves, those on the ocean’s surface. Ocean waves originate from wind blowing – steady winds or high storm winds – over the water. Sometimes these winds are far from where the ocean waves are seen.
Tsunami
Tsunami are described in the Earthquakes chapter as damaging waves that result from the sharp jolt to the water from an undersea earthquake. Landslides, meteorite impacts, or any other jolt to ocean water may form a tsunami . Tsunami can travel at speeds of 800 kilometers per hour (500 miles per hour).
Tsunami have small wave heights and long wavelengths so they are usually unnoticed at sea. As the wave rides up the continental shelf the wave height increases.
2)Tides are very useful, following are the different ways:
• High tides help in navigation. This helps the ships to arrive at the harbour more easily.
• The high tides also help in fishing.
• Tides are also helpful in generating electricity.
3)
During the full moon and new moon phases, the Moon and the Sun are aligned and their effects combined, producing the spring tides. On the tide tables we can see the high tidal coefficient of the tides when both celestial bodies are aligned.
There is a proven increase in the activity of fish during spring tides, above all if these coincide with sunrise or sunset, and these are the most propitious days for fishing
Neap tides
During waxing and waning moons, on the contrary, the effects are detracted, thereby obtaining tides of less amplitude (lower tidal coefficient), called neap tides.
The movement on the seabed tends to be less and this normally results in days that are less propitious for fishing than days with spring tides.