The propierties of water

Water properties

Before we begin looking at the properties of water, maybe you'd like to take our True/False quiz about water properties. Some of the answers may surprise you.

What are the physical and chemical properties of water that make it so unique and necessary for living things? When you look at water, taste and smell it - well, what could be more boring? Pure water is virtually colorless and has no taste or smell. But the hidden qualities of water make it a most interesting subject.

the water have 3 states

solid: for example, ice

Water pollution: is the contamination of water bodies such as lakes, rivers, oceans, and groundwater. All water pollution affects organisms and plants that live in these water bodies and in almost all cases the effect is damaging either to individual species and populations but also to the natural biological communitis. It occurs when pollutans are discharged directly or indirectly into water bodies. without adequate treatment to remove harmful constituents.

Industrial waste is a type of waste produced by industrial activity, such as that of factories, mills and mines. It has existed since the outset of the industrial revolution.

Much industrial waste is neither hazardous nor toxic, such as waste fiber produced by agriculture and logging.

Toxic waste and chemical waste are two designations of industrial waste.

Sewage treatment can be used to clean water tainted with industrial waste.

OIL SLICKS

Oil slicks float on oceans and seas, covering them in a thick film of crude or refined petroleum oil. When freight ships carrying tens of thousands of tons of fuel crash, malfunction, or encounter harsh weather, they spill enormous amounts of oil into the water. Since oil and water don't mix, the oil spreads out into a layer that hovers, as one mass, on top of the ocean.

martes 4 de agosto de 2009
how aquatic creatures adapt
many organisms live in a water medium. these creatures are well-adapted for moving and breathing in water.

- aquatic plants and weeds have flexible steams which do not break when they are moved by the current. they don need strong stems like plants on land because the water support them.

-aquatic animals usually have a streamlined shape like, for example a fish so that they can overcome the resistance of water. their extremities are usually wide like oars.

BREATHING IN WATER

aquatic plants and animals obtain their oxygen from the oxygen dissolved in water.

-aquatic plants breathe thought their leaves like plants like plants on land.

-aquatic animals have different organs for obtain oxygen from water. fish for example, have organs called gills which they use for breathing. gills are made up of small filaments which take in oxygen and expel carbon dioxide. this system.

water

THE WATER PLANET

what is water?

water is a colpourness, odourless and tasteless liquid.

this definition refers to pure water. it is in fact extremely

difficult to find pure water in our surroundings. an example

what we usually means by water es the in the rivers and

seas orv tap water and this water is a mixture of various substances.

the predominant substancee in these mixtures is purewater but pthers substances

are suspended in solutions, usually mineral salts. the great variety of

salts that can be suspended in water means that there are different

types of water. sea water has more salt content than river water

tap water alse has salts and other substances which are added to makes

it safe for drinking.

Water

WATER

The lasic definition of water is as follows:

Water is a colorless, odourless and tasteless liquid.

This refers to pure water.

What we usually mean by water is the water in the rivers and seas or top water is the water in the rivers and seas or tap water and this water is a mixure of varius subtances.

The predominant subtance in these mixure is pure water but other subtances are suspended in the solution, usually mineral salts. The great variety of salts that can be suspended in water means that there are different types of water. Sea water has more salt content than river water. Top water also has  salts and other subtances which are added to make it save for drinking.

The water molecule:

Water is made up of molecule consisting of atoms fro two elements hydrogen and oxygen. Each molecule is made up of one atom of oxygen and two atoms of hydrogen.

Notice that since water is in a liquid state the molecules are scattered about and can move relatively freely amongst themselves

otation: the rotation produce the change of tha day to night

inclination and revolution: produce the seasons

The Moon

is a satellite of this earth

Movements of the Moon

moves around of the earth and it takes abaut one month to produce this movement

the other side of the Moon is called the darcksite

Luna Phases

Lunar Eclipses

Lunar eclipse

From Wikipedia, the free encyclopedia

Schematic diagram of the shadow cast by the Earth. Within the central umbra shadow, the Moon is totally shielded from direct illumination by the Sun. In contrast, within the penumbra shadow, only a portion of the sunlight is blocked.

As seen by an observer on Earth on the imaginarycelestial sphere, the Moon crosses the ecliptic every orbit at positions called nodes twice every month. When the full moon occurs in the same position at the node, a lunar eclipse can occur. These two nodes allow two to five eclipses per year, parted by approximately six months. (Note: Not drawn to scale. The Sun is much larger and farther away than the Moon.)

As viewed from Earth, the Earth's shadow can be imagined as two concentric circles. As the diagram illustrates, the type of lunar eclipse is defined by the path taken by the Moon as it passes through Earth's shadow. If the Moon passes through the outer circle but does not reach the inner circle, it is a penumbral eclipse; if only a portion of the Moon passes through the inner circle, it is a partial eclipse; and if entire Moon passes through the inner circle at some point, it is a total eclipse.

A lunar eclipse occurs whenever the Moon passes through some portion of the Earth's shadow. This can occur only when the Sun,Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, there is always a full moon the night of a lunar eclipse. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes. The next total lunar eclipse occurs on December 21, 2010. The next eclipse of the Moon is a penumbral eclipse on July 7, 2009.

Types of lunar eclipses

The shadow of the Earth can be divided into two distinctive parts: the umbra and penumbra. Within the umbra, there is no direct solar radiation. However, as a result of the Sun's large angular size, solar illumination is only partially blocked in the outer portion of the Earth's shadow, which is given the name penumbra.

A penumbral eclipse occurs when the Moon passes through the Earth's penumbra. The penumbra does not cause any noticeable darkening of the Moon's surface, though some may argue it turns a little yellow. A special type of penumbral eclipse is a total penumbral eclipse, during which the Moon lies exclusively within the Earth's penumbra. Total penumbral eclipses are rare, and when these occur, that portion of the Moon which is closest to the umbra can appear somewhat darker than the rest of the Moon.

A partial lunar eclipse occurs when only a portion of the Moon enters the umbra. When the Moon travels completely into the Earth's umbra, one observes a total lunar eclipse. The Moon's speed through the shadow is about one kilometer per second (2,300 mph), and totality may last up to nearly 107 minutes. Nevertheless, the total time between the Moon's first and last contact with the shadow is much longer, and could last up to 3.8 hours.^[1] The relative distance of the Moon from the Earth at the time of an eclipse can affect the eclipse's duration. In particular, when the Moon is near its apogee, the farthest point from the Earth in its orbit, its orbital speed is the slowest. The diameter of the umbra does not decrease much with distance. Thus, a totally-eclipsed Moon occurring near apogee will lengthen the duration of totality.

 Matter

what is matter? every thing that sound rounds as is make for matter, the earth,the rocks,animals,plants,everything,we cut define matter as all that ocupies space and can be weghed, when we are studie matter we use some basic quantities suchas lenght,surface area volume,mass,densit,or temperature.   so that are all using the same units in science we use what is called the internacional sismems in unites (S.A)