St Aidens- National Water Week, downloads, printables & workbooks

ST AIDEN'S
NATIONAL WATER WEEK
downloads, printables & workbooks

SITES FOR TEACHERS

SITES FOR PARENTS

Ocean Alert Interactive Study
Explore lots of interactive learning about the oceans of the world with this
incredible multimedia presentation from the DiscoveryChannel.

I have some wonderful complimentary download workbooks , lesson
plans, colour sheets, board games, & activities information sheets from
various US & Other agencies. Please feel free to download and
distribute... I will be searching for more free downloadable lesson plans
and activities for you to download FREE of charge. Please also check out
or Colour & Activity Main Category Listing for any theme-based
workbooks.

Hydrology - All the Water in the World
Hydrology - Colour me a Watershed
Personal Use Water Survey
Hydrology Water Cycle Game
Hydrology Water Works
Spring Tide Information & Worksheet PDF

Water covers nearly three quarters of the Earth's total
surface. To be more specific, it is estimated that the Earth
contains about 1.46 million cubic km of water. Of this 97.3
per cent is in the oceans and inland seas. The rest 2.7 per
cent is found as glaciers and ice caps, fresh water lakes,
rivers. And besides this surface water there is underground
water.

And all the water, from the oceans to the string-like streams
and the water that is dug out from beneath, available on
the Earth, is called hydrosphere.

Water flows in cycle. Rain falls. Some of it is absorbed by
soil. While some evaporates. But most of it moves across
the surface of the land, first as brooks, then streams and
rivers. The rivers cut and broaden their valleys on the way
to the sea. As water follows a downward course due to
earth's attraction, it reaches ultimately to the seas.

As water from these bodies, gets evaporated, heated by
the sun, it goes up to form clouds. Clouds are also formed
when warm air blows over colder land masses or water. Or,
when it travels over a colder air mass, or, when it moves up
high mountainous slope. However, its only the rain clouds
that cause downpour. Rain, snow, fog, mist, and dew, are
formed moistures in the air condenses. And it condenses
when the air is warm enough to hold the evaporated
moistures. Such condensed vapor forms dew, or,
sometimes fog, with a sudden drop in temperature.
Condensation also occurs when the air rises high enough
and the temperature suddenly drops. At that time it
becomes too heavy to hold condensed water vapor. This
condensed vapor comes down as droplets of rain or
crystalises as snow.

Oceans and Seas:
The waters of oceans and seas are always in a great
tireless motion and thus causing commotion. Surging,
swelling, rolling, breaking, swirling and dancing in rhymes
of peaks and troughs. It is the heat from the sun that
causes ocean fuss round the clock.

When the sun warms up the water in the equatorial
regions water expands and swells up a few inches. But
water always finds for a lower level. Thus the extra rise in
water level at the Equator cannot hold on. It soon rushes
down in two directions - the North Pole and the South Pole.

But this motion is general. Besides this the waves vary in
height and length from one region to another. This is
mainly because of the variations in the blowing of the
wind. The force, the duration, and area across which the
wind travels controls the waves.

Again the water in the polar region is heavy because of
the cold. So it sinks below the upcoming warm water and
slowly crawls along the bottom to the Equatorial region to
be warmed. While these two directional flow goes on, the
Earth's daily rotation causes more complication.
Oceans merge into one another in such a smooth way
that it is hard to demarcate them. However, the oceans
come under four names. The Pacific, the largest of all. The
Atlantic, Indian, and Arctic - the frozen ocean, come
respectively according to their size.

These oceans, by definition, include the seas, bays, gulfs
and other ocean inlets attached to them. Some of the
major seas include the South China Sea, the world's
largest. As also Caribbean Sea, the Mediterranean, to
name a few.

Rivers, lakes and ponds:
Among the rivers the Amazon in South America is the
world's largest. Others include the Nile of Egypt,
Mississippi-Missouri, of United States, and Volga in the CIS.

The lakes may be of sweet water type or, salt water one.
Sweet water natural lakes include the Lake Superior of
North America, and the Titicaca of South America among
many. The Chilka in India is a salt water lake.

Ground water:
Some of the water that falls on the land as rain
evaporates. Some is absorbed by the soil and rocks.
Water in the soil and in the pores and cracks of rocks
below the surface is called ground water. Most ground
water is rain water containing dissolved carbon dioxide
and oxygen. There is a little which was trapped in the
original sediments and a very small amount comes up from
the molten lavas of magmas from deep inside the Earth.

Water Conservation
Water Conservation Resources