Last updated on May 13th, 2022 at 09:41 am
- Tide
- Ocean current
- Wave
Match the following
Caspian Sea | Largest lake |
Tide | Periodic rise and fall of water |
Tsunami | Strong seismic waves |
Ocean currents | Streams of water moving along definite paths |
Water cycle |
Water Class 7 Questions and Answers
Our earth is like a terrarium. The same water that existed centuries ago still exists today.
The major sources of freshwater are the rivers, ponds, springs, and glaciers.
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.
The dead sea in Israel has a salinity of 340 grams per liter of water.
March 22 is celebrated as World Water Day.
When the water on the surface of the ocean rises and falls alternately, they are called waves.
The largest tsunami ever measured was 150m. high. These waves travel at a speed of more than 700 km. per hour. The tsunami of 2004 caused widespread damage in the coastal areas of India.
The Indira Point in the Andaman and Nicobar Islands got submerged after the tsunami.
At high tide, the water covers much of the shore by rising to its highest point. Low tide occurs when the water drops to its lowest level and recedes from the shore.
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.
The Labrador Ocean current is a cold current while the Gulf Stream is a warm current.