St Aidens- National Water Week, Water conservation & resources

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 vapour 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
vapour. This condensed vapour 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.
LIVING THINGS NEEDS WATER FREE EBOOK

Water Conservation
Water Conservation Resources