Water



--> Terrarium: It is an artificial enclosure for keeping small house plants.

--> The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.

--> Salinity is the amount of salt in grams present in 1000 grams of water. The average salinity of the oceans is 35 parts per thousand.

-->Dead sea in Israel has salinity of 340 grams per litre of water. Swimmers can float in it because the increased salt content makes it dense.

-->March 22 is celebrated as World Water Day when the need to conserve water is reinforced in different ways.

-->Waves are formed when winds scrape across the ocean surface. The stronger the wind blows, the bigger the wave becomes.

--> An earthquake, a volcanic eruption or underwater landslides can shift large amounts of ocean water. As a result a huge tidal wave called tsunami.

--> Tsunami is a Japanese word that means “Harbour waves” as the harbours get destroyed whenever there is tsunami.

--> The rhythmic rise and fall of ocean water twice in a day is called a tide.

--> During the full moon and new moon days, the sun, the moon and the earth are in the same line and the tides are highest. These tides are called spring tides.

-->Generally, the warm ocean currents originate near the equator and move towards the poles.

--> Tick the correct answer.

(i) The process by which water continually changes its form and circulates between oceans, atmosphere and land
(a) Water cycle
(b) Tides
(c) Ocean currents

(ii) Generally the warm ocean currents originate near (a) Poles
(b) Equator
(c) None of these

(iii) The rythmic rise and fall of ocean water twice in a day is called
(a) Tide
(b) Ocean current
(c) Wave

--> Match the following.

(i) Caspian Sea              (a) Largest lake
(ii) Tide              (b) Periodic rise and fall of water
(iii) Tsunami              (c) Strong seismic waves
(iv) Ocean currents              (d) Streams of water moving along definite paths
                          (e) Water cycle