Warm Currents

Cold Currents

1. Warm currents bring warm water into cold water areas and are usually observed on the east coasts of continents in the low and middle latitudes.

2. In the Northern Hemisphere they are found in west coasts of continents in high latitudes.

3. They have temperature, higher than that of the surrounding water and raise the temperature of water through which they pass.

1. Cold currents bring cold water into warm water areas. These currents are usually found on the west coasts of the continents in the low and middle latitudes.

2. They are also found on the east coasts in the higher latitudes in the Northern Hemisphere.

3. Their temperature is lower than that of surrounding water and bring a fall in temperature wherever they go.

Spring Tides

Neap Tides

(i) It is a tide with a range considerably increased from that of the mean tidal levels.

(ii) It occurs twice each month around the time of the new moon and full moon.

(iii) The high tides are somewhat lower than the average.

(iv) It is due to complementary gravitational effects caused when the earth, moon and sun are in a straight line.

(i) It is tide with a range considerably lower than that of the mean tidal level.

(ii) It occurs twice each month during Lunar quadrature.

(iii) The high tides are somewhat lower and low tides are somewhat higher than average.

(iv) Here tidal production forces do not supplement each other because the moon, the earth and the sun are at right angles. So the velocity of tidal currents slows down.