The deepest surface depression on the earth is

(1) Kurile Trench

(2) Mariana Trench

(3) Tonga-Kermadec Trench

(4) Bentley Subglacial

Echo sounding is the technique applied to—

(1) measure the depth of the sea

(2) measure the amplitude of sound waves

(3) record earthquake waves

(4) record the density of air in the atmosphere

El Nino is

(1) a warm ocean current

(2) sea storm

(3) tropical disturbance

(4) another name of typhoon

The narrow stretch of water connecting the two Seas is called

(1) Bay

(2) Peninsula

(3) Isthmus

(4) Strait

The largest ocean is

(1) Atlantic Ocean

(2) Indian Ocean

(3) Arctic Ocean

(4) Pacific Ocean

Which current is responsible for the increase in the temperature of western Europe ?

(1) Labrador current

(2) Gulf stream

(3) Canari current

(4) North Equatorial current

Tsunamis are caused by

(1) mixing of cold and warm currents

(2) earthquakes

(3) changes in sea level

(4) volcanic eruption

Seismic sea waves which approach the coasts at greater force are known as

(1) Tides

(2) Tsunami

(3) Current

(4) Cyclone

Which of the following is a cold ocean current?

(1) Humboldt current

(2) Brazil current

(3) Oyashio current

(4) Canary current

The sea breeze is formed during

(1) Day time

(2) Night time

(3) Both

(4) Seasonal

The coral reefs are the marine counterparts of

(1) Temperate forests

(2) Tropical rain forests

(3) Savannahs

(4) Scrubland