The Sunda Trench lies in the______ ocean.

(a)

Atlantic

(b)

Pacific

(c)

Indian

(d)

Antarctic

Ocean currents are produced due to________

(a)

due to rotation of earth

(b)

due to variation in temperature

(c)

due to earth's movement

(d)

all the above

Which of the following is not correctly matched?

(a)

Gulf Stream - Pacific Ocean

(b)

Labrador current - North Atlantic Ocean

(c)

Canary current - Mediterranean sea

(d)

Mozambique current - Indian Ocean

The amount of planktons to be found in the ocean is determined by
1. Depth of the water.
2. Ocean currents.
3. Temperature and Salinity.
4. Length of day and night.

(a)

1 and 2 are correct

(b)

1,2 and 3 are correct

(c)

1,3 and 4 are correct

(d)

All are correct

Mariana trench

(1)

On full and new moon days

Great Barrier Reef

(2)

Second order landform

Spring tides

(3)

Australia

Heavy rains

(4)

Deepest point in the Pacific

Continental slope

(5)

Decreases salinity in the oceans

Spring tide and Neap tide.

The oceans are salty. Why?

What is hydrological cycle?

Write a brief note on sea waves.

What do you mean by the ocean salinity?