Answer these questions in 10–20 words.
a) What is are the three types of movement of Ocean Currents.
b) What are Ocean currents?
c) Which part of Andaman and Nicobar Islands was submerged totally in the 2004 tsunami?
d) What are tides? And how was it caused?
e)Name the factors which give rise to ocean currents and modify their courses.
Answers
Answer:
1.the three main forms of ocean water movement are waves tides and ocean currents sea-waves when we blow air on the surface of tea ripples are formed the wind pushes seawater in the same.
2. An ocean current is a continuous, directed movement of sea water generated by a number of forces acting upon the water, including wind, the Coriolis effect, breaking waves, cabbeling, and temperature and salinity differences.
3. Indira Point (6°45'10″N and 93°49'36″E), the southernmost point of the Great Nicobar Island and India itself, subsided 4.25 metres (13.9 ft) in the tsunami and its lighthouse was damaged.
4.High and low tides are caused by the moon. The moon's gravitational pull generates something called the tidal force. The tidal force causes Earth—and its water—to bulge out on the side closest to the moon and the side farthest from the moon. These bulges of water are high tides.
5.Following are the four important factors that give rise to ocean currents or modify their course:
Rotation of the Earth.
The shapes of the coastlines.
Effects of planetary winds on the ocean surface.
Difference in the density of ocean water due to variations in temperature and salinity.