Which of the following can cause a tsunami?

(1) Volcano

(2) Avalanche

(3) Tornado

(4) Earthquake

The coastal part of water bodies of the oceans which is structurally part of the mainland of the continents is called

(1) isthmus

(2) oceanic ridge

(3) continental shelf

(4) continental slope

Mariana Trench is found

(1) Atlantic Ocean

(2) Pacific Ocean

(3) Indian Ocean

(4) Arctic Ocean

Which one of the following ocean currents do not occur in AtAtlantic Ocean?

(1) Gulf stream

(2) Brazil current

(3) Peru current

(4) Canary current

The main cause of Tsunami is :

(1) Volcanoes

(2) Cyclones

(3) Earthquake on the sea floor

(4) Moon’s attraction

Tides are caused by the gravitational pull of the

(1) Earth on the Moon

(2) Earth on the Sun

(3) Sun and Moon on the Earth

(4) Moon on the Earth

Tides in the sea are caused by

(1) effect of Sun

(2) effect of Moon

(3) eombined effect of Moon and Sun

(4) gravitational force of Earth and Sun

Seawater is saltier than rainwater because

(1) rivers wash away salts from the earth and pour them into the sea

(2) sea beds have salt-producing mines

(3) sea animals are salt-producing

(4) the air around the sea is saltish

In the sea, plants are restricted up to the depth of

(1) 20 m

(2) 200 m

(3) 1000 m

(4) 2000 m

El Nino occurs over

(1) Atlantic Ocean

(2) Indian Ocean

(3) Pacific Ocean

(4) Mediterranean Sea

The Sargasso sea is situated in the :

(1) Atlantic Ocean

(2) Pacific Ocean

(3) Indian Ocean

(4) Arctic Ocean