Gold
.... stand corrosion. "By at least the
fourth millennium BC, gold was found through both placer and vein(lode)
mining and by the time of the early cultures from which modern civilization
is descended the search for gold was wide spread"(Green 1968).
Gold is mainly extracted through mining. It is mainly found in
tiny flakes or sands but sometimes is found in nuggets. The largest nugget
ever found weighed eight kilograms. "Gold deposits are usually classified
as lode, placer, massive or disseminated types .....
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Microbiology
.... rickettsiae.
A microbiologist is a scientist who studies life forms that can
only be observed by means of a microscope. Microbiologists use many
criteria to classify bacteria.
The Beginning of Microbiology
Zacharias Jansen created the microscope. Although Robert Hooke is
the one who made it widely known. In 1665 Hooke published a book called
Micrographie. It contained his thoughts on chemistry as well as a
description and list of uses for a microscope. With this he opened the
door to microbiology. .....
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The Planet Mars
.... They’ll use 3 different
space ships: A habitat lander, a cargo lander, and a crew transport
vehicle. The CTV carries them to the habitat lander. They land on Mars,
and do their business. When they’re done, the habitat lander takes them
back up to orbit where they meet back up with their CTV, waiting patiently
in orbit, that takes them back home.
The money issue is being handled in many different ways. The most
successful plan so-far is the ThinkMars plan. Students at MIT and Harvard
are setting up a .....
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Electrolytes
.... ions that are able to conduct
electricity, the dissociation of Ionic Compounds, and the Ionization of
Polar Covalent Molecular Substances.
The Dissociation of Ionic Compounds is where particles are
ionically (electrically) bonded together. They already made out of cations
and anions, but in their solid state the ions are locked into position in
their crystal structure, and can’t move around. When the ionic compound is
dissolved into water the water molecules, which are polar,(having a
positive and a ne .....
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Iron And Rust
.... the iron from
corroding. This method is also satisfactory but is also expensive. The
most common example of this method is galvanizing, in which iron is covered
with zinc. (3) Covering iron with an air proof and also a water proof
substance. This method is the least expensive, therefore it is the most
common.
The forming of rust is known as a chemical reaction. A chemical
reaction is defined as a process by which atoms are redistributed,
resulting in a change in the molecular composition of the .....
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Gold
.... metal is used in many ways including, tooth
filling because it doesn't rust away or crack, also it is used for the
covering or sealing of an astronaut's helmet. Gold is also a very good
conductor of electricity.
As you can see, gold is an element that is not only a great gift
for someone, but is very usefull if actually put to use. The main drawback
to gold is that it is a very precious metal. We dont have an unlimited
supply of it. This is why gold today is priced so high and really doesn't
drop that .....
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The Monkey
.... and feet are prehensile, with, typically, five digits on each, the
first (thumb and big toe) being divergent from the others. Commonly, the
digits have flattened nails, but those of the marmoset are an exception.
Except for the night-roaming durukuli of tropical America, monkeys are
active during the day, moving frequently in bands in search of vegetation,
birds' eggs, smaller animals, or insects to eat. Monkeys are highly social
animals and are often organized in clans headed by an old male; these .....
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Triceratops Hottidus: “Horrible Three-horned Face”
.... of the dinosaur species evolve before the Cretaceous-
Tertiary extinction 65 million years ago.
BEHAVIOR:
Triceratops was probably a herding animal, like the other
Cartesians. This hypothesis is supported by the fining of bone beds, large
deposits of bones of the same species in am area.
Triceratops hatched from eggs, which may have been cared for by
adults.
Which threatened by predators, Triceratops probably changed into
its enemy, like the modern-day rhinoceros does. This was probably a very
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Compressed Gas: Helium
.... of
gases in the normal breathing process, the blood stream absorbs oxygen
from air in the lungs, while carbon dioxide passes from the blood to the
air. When you hold your breath, the exchange of gases slows, as "stale"
air in the lungs is no longer replaced by "fresh" air. Oxygen is
actually removed from the blood stream during the exchange of gases.
depending on how completely oxygen is replaced by helium, you may lose
consciousness quickly and without warning - you may literally pass out
whil .....
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The Problem With The Amount Of Trash In The United States
.... each year and we need to put a stop to this.
Trash is not a problem far from us, it is right here in our
community. People are throwing things on the floor all the time and
recycling has not been done as much as it should be. In New York city we
have one of the world’s most largest and most crowded landfills which is
proven in the article. Fresh Kills landfill, on Staten Island is extremely
big but will be closed in a few years. I New York State there were 1600
landfills in the 1960’s and today .....
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Power Of The Atom
.... a horses. Something needed to be
done. It took way too long to get into contact with people, and it took
the same amount of time to get a response.
In 1886, a man by the name of Alexander Graham Bell developed an
interesting object, that gave you the capability of talking live with one
person, other then yourself. This object later became known as the well
respected telephone. Although when Bell first invented the phone there were
many kinks that needed to be worked out. And over time, after being
cons .....
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The Positive Effects Of DDT
.... altogether. It has been repeatedly proven that DDT does not
cause any form of cancer in humans. Contrary to what environmentalist
attacks on the pesticide have alleged, the benefits of DDT far exceed the
flaws.
DDT was first synthesized in 1887 and patented as an insecticide in
1939 by a Swiss chemist, Dr. Paul Müller (Whelan 69). It initially became
popular because of its effectiveness against insects, specifically clothes
moths and parasites of both animals and plants. DDT was welcomed as a
su .....
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Nuclear Weapons And Their Hazards
.... Like in On The Beach, all
the radiation move towards Australia and everyone innocent people died.
A large-scale nuclear war would lessen food production over large
expanses in the Northern Hemisphere, this could occur through acute
climatic conditions which chilling or freezing temperatures occurring for
brief periods during the growing season which could destroy crops or lower
production. As result of the variety of potential physical and societal
disruptions to agriculture from a large-scal .....
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Human Impact On Air And Climate
.... but
which are not part of the climate system itself. Based on statistical
comparisons of reconstructed northern hemisphere temperatures, the best
estimates indicate that natural changes in the brightness of the sun and
volcanic emissions both played an important role in governing climate
variations over the period studied. But over the past few decades,
greenhouse gases produced by human activities appear to have had an
increasing influence on temperatures. "The anomalous warmth of several
recent yea .....
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The Shrew
.... were about 2.5 cm round, from
25 cm to 1.5 m long, and not more than 20 cm below the surface. Each burrow
has a large area at the end for the nest which was composed of shredded
grass. These nests were used for young or as a resting place for groups of
adult shrews.
Compared to most types of shrews, the least shrew is sociable, and
several may be kept together in captivity without conflict. They sleep
together and help eachother to some degree in digging tunnels and finding
food. One nest found in Decem .....
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