Hindi
Study the Names of the sweets in Hindi for a
review on Tuesday, 22/3/16
Science
Save the following content and answer the questions that follow. Submit the same on the following day.
Sources
of Water
Rainwater,
oceans, rivers, lakes, streams, ponds and springs are natural sources of water.
Dams, wells, tube wells, hand-pumps, canals, etc, are man-made sources of water.
Rain
Water:
Rain
water collects on the earth in the form of surface water and underground
water.
a)
Surface Water
Water
present on the surface of the earth in the form of oceans, rivers, lakes, ponds
and streams is called surface water. The water in rivers and lakes comes from
rain and melting of snow on mountains. Rivers flow into the sea.
b) Underground
Water
Some of
the rainwater seeps through the soil on to the non-porous rocks below. This is
underground water. Sometimes due to high pressure, this water sprouts out in
the form of springs. It can be obtained by digging wells, sinking tube wells, etc.
Canal - a man-made waterway, usually connected to (and sometimes
connecting) existing lakes, rivers, or oceans
Creek - a small stream
Dam - a barrier across flowing water that obstructs, directs or slows
down the flow, often creating a reservoir, lake or impoundment.
Glacier - a large collection of ice or a frozen river that moves slowly
down a mountain.
Lake - a body of water, usually freshwater, of considerable size
contained on a body of land.
Moat - a deep, broad trench, filled with water, surrounding a
structure, installation, or town.
Ocean - a major body of salty water that, in totality, covers about 71%
of the Earth's surface.
Pool - various small bodies of water such as a swimming pool,
reflecting pool, pond, or puddle
Pond - a body of water smaller than a lake, especially those of
man-made origin.
Reservoir
- an artificial lake, used to store water for various uses.
Spring - a point where groundwater flows out of the ground.
Sub-glacial
lake - a lake that is permanently covered by ice and whose water remains liquid
by the pressure of the ice sheet and geothermal heating. They often occur under
glaciers or ice caps.
Oceans
Oceans
cover more than 71% of the Earth's surface.
There
are five Oceans covering the surface of our globe:
The
Pacific Ocean, the Atlantic Ocean, the Indian Ocean as well as the Arctic Ocean
and the Southern Ocean.
Pacific
Ocean
The
Pacific Ocean is the biggest ocean of the world and covers more than 30% of the
Earth's surface.
Atlantic
Ocean
The
Atlantic is the second biggest ocean in the world and is between the continents
of America and Europe and Africa.
The
Atlantic Ocean is about half the size of the Pacific Ocean and covers roughly
20% of the Earth's surface.
Indian
Ocean
The Indian Ocean is located
between Africa and Austral-Asia.
The Northern Indian Ocean also
is the most important transport route for oil as it connects the oil-rich
countries of the Middle East Each with Asia.
Arctic
Ocean
The Arctic Ocean is located
around the North Pole across the Arctic circle.
Southern
Ocean
The
Southern Ocean is located around the South Pole across the Antarctic circle in
the Southern Hemisphere off Antarctica.
Oceans
area-wise:
Pacific (155,557,000 sq km)
Atlantic
(76,762,000 sq km)
Indian (68,556,000 sq km)
Southern
(20,327,000 sq km)
Arctic (14,056,000 sq km)
Q1. Name 4 natural and man –made
sources of water. Write a sentence for and draw diagrams for each.
Q2. How do springs occur on earth naturally?
