A place where there is a constant intermingling of salt water and fresh water is ____

(1) Estuary

(2) Delta

(3) Gulf

(4) Bay

The deepest ocean of the world is

(1) Atlantic Ocean

(2) Arctic Ocean

(3) Indian Ocean

(4) Pacific Ocean

Tides in the sea have stored in them :

(1) Hydraulic energy

(2) Kinetic energy

(3) Gravitational potential energy

(4) A combination of all the above three forms of energy

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